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CN-122029048-A - Biodegradable coated paper products and methods thereof

CN122029048ACN 122029048 ACN122029048 ACN 122029048ACN-122029048-A

Abstract

A biodegradable coated paper product comprising a paper substrate and a layer disposed on the paper substrate, wherein the layer is formed from a biodegradable coating composition comprising a cellulose ester of Cellulose Acetate Propionate (CAP) in an amount of 5.5 to 15 weight percent based on the total weight of (a), (b) and (c), b a biodegradable polymer of a polyester in an amount of 45 to 75 weight percent based on the total weight of (a), (b) and (c), and c an inorganic filler in an amount of 12 to 40 weight percent based on the total weight of (a), (b) and (c), wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate adipate) (PBSA), polycaprolactone (PCL), poly (butylene adipate terephthalate) (PBAT), polylactic acid (PLA), and combinations thereof.

Inventors

  • HU XIAOBO
  • FANG YICHEN
  • Kostubu Vicinu Apt

Assignees

  • 伊士曼化工公司

Dates

Publication Date
20260512
Application Date
20240917
Priority Date
20230918

Claims (16)

  1. 1. A biodegradable coated paper product, the product comprising a paper substrate and a layer disposed on the paper substrate, wherein the layer is formed from a biodegradable coating composition comprising: a. Cellulose ester, which is Cellulose Acetate Propionate (CAP), in an amount of 5.5 to 15 wt% based on the total weight of (a), (b) and (c); b. A biodegradable polymer which is a polyester in an amount of 45 to 75% by weight based on the total weight of (a), (b) and (c), and C. An inorganic filler in an amount of 12 to 40 wt% based on the total weight of (a), (b) and (c); Wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate adipate) (PBSA), polycaprolactone (PCL), poly (butylene adipate terephthalate) (PBAT), polylactic acid (PLA), derivatives thereof, and combinations thereof, Wherein the CAP has an average Degree of Substitution (DSOH) of 0.3 to 1.2, an average degree of substitution of acetyl substituents (DSAc) of 0 to 0.5, an average degree of substitution of propionyl substituents (DSPr) of 1.8 to 2.7, and a falling ball viscosity of 0.05 to 30 seconds as measured according to ASTM D-1343, Wherein the biodegradable coating composition has a glass transition temperature (Tg) of-40 to-10 ℃, a melting temperature (Tm) of 80 to 110 ℃, a crystallization temperature (Tc) of 40 to 70 ℃, and Wherein the biodegradable coating composition has a Young's modulus of greater than 700 MPa, an elongation at break of 10% to 300%, and a Water Vapor Transmission Rate (WVTR) of less than 600 g mil/(m 2 day).
  2. 2. The biodegradable coated paper product according to claim 1, wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate adipate) (PBSA), poly (butylene adipate terephthalate) (PBAT), derivatives thereof, and combinations thereof.
  3. 3. The biodegradable coated paper product according to claim 1 or 2, wherein the inorganic filler is calcium carbonate.
  4. 4. The biodegradable coated paper product according to claims 1-3, wherein the amount of the inorganic filler is 20 to 40 wt% of the biodegradable coating composition.
  5. 5. The biodegradable coated paper product according to claims 1-4, wherein the CAP has an average degree of substitution of hydroxyl substituents of 0.5 to 1.0, an average degree of substitution of acetyl substituents (DSAc) of 0 to 0.2, an average degree of substitution of propionyl substituents (DSPr) of 2.0 to 2.5, and a falling ball viscosity of 0.1 to 5 seconds as measured according to ASTM D-1343.
  6. 6. The biodegradable coated paper product according to claims 1-5, wherein the biodegradable coating composition has a crystallization temperature (Tc) of 40 to 60 ℃.
  7. 7. The biodegradable coated paper product according to claims 1-6, wherein the biodegradable coating composition has a viscosity (V200) at 200 ℃ and 10 rad/s of 500 to 800 Pa-s and a viscosity ratio (V65/V200) of less than 28, wherein V65 is the viscosity measured at 65 ℃ and 10 rad/s.
  8. 8. The biodegradable coated paper product according to claims 1-7, wherein the weight of the paper substrate is from 50 gsm to 350 gsm.
  9. 9. A method of making a biodegradable coated paper product, the method comprising: Providing a paper substrate; Extrusion coating a layer onto the paper substrate to form a biodegradable coated paper product, Wherein the layer is formed from a biodegradable coating composition comprising: a. Cellulose ester, which is Cellulose Acetate Propionate (CAP), in an amount of 5.5 to 15 wt% based on the total weight of (a), (b) and (c); b. A biodegradable polymer which is a polyester in an amount of 45 to 75% by weight based on the total weight of (a), (b) and (c), and C. An inorganic filler in an amount of 12 to 40 wt% based on the total weight of (a), (b) and (c); Wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate adipate) (PBSA), polycaprolactone (PCL), poly (butylene adipate terephthalate) (PBAT), polylactic acid (PLA), derivatives thereof, and combinations thereof, Wherein the CAP has an average Degree of Substitution (DSOH) of 0.3 to 1.2, an average degree of substitution of acetyl substituents (DSAc) of 0 to 0.5, an average degree of substitution of propionyl substituents (DSPr) of 1.8 to 2.7, and a falling ball viscosity of 0.05 to 30 seconds as measured according to ASTM D-1343, Wherein the biodegradable coating composition has a glass transition temperature (Tg) of-40 to-10 ℃, a melting temperature (Tm) of 80 to 110 ℃, a crystallization temperature (Tc) of 40 to 70 ℃, and Wherein the biodegradable coating composition has a Young's modulus of greater than 700 MPa, an elongation at break of 10% to 300%, and a Water Vapor Transmission Rate (WVTR) of less than 600 g mil/(m 2 day).
  10. 10. The method of claim 9, wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate adipate) (PBSA), poly (butylene adipate terephthalate) (PBAT), derivatives thereof, and combinations thereof.
  11. 11. The method of claim 9 or 10, wherein the inorganic filler is calcium carbonate.
  12. 12. The method of claims 9-11, wherein the amount of the inorganic filler is 20 to 40 weight percent of the biodegradable coating composition.
  13. 13. The method of claims 9-12, wherein the CAP has an average degree of substitution of hydroxyl substituents of 0.5 to 1.0, an average degree of substitution of acetyl substituents (DSAc) of 0 to 0.2, an average degree of substitution of propionyl substituents (DSPr) of 2.0 to 2.5, and a falling ball viscosity of 0.1 to 5 seconds as measured according to ASTM D-1343.
  14. 14. The method of claims 9-13, wherein the biodegradable coating composition has a crystallization temperature (Tc) of 40 to 60 ℃.
  15. 15. The method of claims 9-14, wherein the biodegradable coating composition has a viscosity (V200) at 200 ℃ and 10 rad/s of 500 to 800 Pa s, a viscosity ratio (V65/V200) of less than 28, wherein V65 is the viscosity measured at 65 ℃ and 10 rad/s.
  16. 16. The method of claims 9-15, wherein the paper substrate has a weight of 50 gsm to 350 gsm.

Description

Biodegradable coated paper products and methods thereof Technical Field Embodiments of the present disclosure generally relate to biodegradable coated paper products and methods of making biodegradable coated paper products. Background In general, paper products (such as paper cups, paper bowls, paper trays, paper cartons and boxes, beverage boxes, nonwoven fabrics, paper containers, etc.) are becoming increasingly popular with consumers because they are considered more natural, biodegradable, and recyclable. Uncoated paper-based packages are generally highly biodegradable in certain environments and are easily recycled in commercial paper recycling systems. However, paper that is completely free of coating or adhesive cannot readily form paper products. Furthermore, the uncoated paper products have poor water/moisture barrier properties. To improve the barrier properties, polyethylene based polymers or other non-biodegradable polymers are coated on the surface of the paper. However, if the coating is too thick, it may negatively impact the recyclability of the paper laminate in a typical commercial paper recycling system. Examples of such problems may include i) the coating blocking filters in the repulping tank and system, ii) the coating tightly holding on the paper fibers, preventing high% of the paper fibers from being released into the water of the repulping system, iii) the coating eventually being incorporated into the recycled paper, negatively affecting the appearance or performance characteristics of the resulting recycled paper. If the coating is made too thin, the overall structure can be considered recyclable in the paper recycling stream if it can be stripped and sent to a landfill or burned to fuel the plant, leaving the paper fibers collected and recycled into the paper. However, this structure still has several drawbacks, as if it is not properly disposed of in the environment, the paper will biodegrade, but the polyethylene-based coating or other non-biodegradable coating will not biodegrade. This can result in durable microplastic, negatively impact the environment or be a non-nutritional food source for some animals. To solve the problem of using polyethylene-based polymeric materials or other non-biodegradable polymeric materials, bio-based materials and biodegradable materials are being developed. However, some new biobased and biodegradable materials have poor processability (slow coating and conversion rates), thin-coated papers have poor adhesion, and high water vapor transmission rates. To address some of these problems, manufacturers have sought to retrofit existing coating/converting machines and apply thicker coatings. However, these variations add significant cost and slow the rate of biodegradation of the coated paper product. Thus, there remains a need for a biodegradable coating composition that can be more effectively applied to paper, with good paper adhesion and a thin coating, such that the resulting paper product has a low water vapor transmission rate and a fast biodegradation rate. Disclosure of Invention Biodegradable coated paper products are disclosed in embodiments herein. The article comprises a paper substrate and a layer disposed on the paper substrate, wherein the layer is formed from a biodegradable coating composition comprising (optionally consisting essentially of or consisting of) a cellulose ester of Cellulose Acetate Propionate (CAP) in an amount of 5.5 to 15 wt.% based on the total weight of (a), (b) and (C), b a biodegradable polymer of polyester in an amount of 45 to 75 wt.% based on the total weight of (a), (b) and (C), and C an inorganic filler in an amount of 12 to 40 wt.% based on the total weight of (a), (b) and (C), wherein the polyester is selected from the group consisting of poly (butylene succinate) (PBS), poly (butylene succinate) (PBSA), polycaprolactone (PCL), poly (butylene adipate terephthalate) (PBAT), polylactic acid (PLA), and combinations thereof, wherein the average Degree of Substitution (DSOH) of the hydroxyl substituent is 0.3 to 1.2, the average Degree of Substitution (DSOH) is 0.05 to 1.2, the average degree of substitution (DSAc) is 0.5 to 20.25-25, and the average degree of glass transition temperature (DSC) is 578 to 20.80, wherein the average degree of glass transition is from 0.578 to 80, the glass transition temperature is measured according to the average glass transition temperature is from 0.5 to 578%, the crystallization temperature (Tc) is 40 to 70 ℃, and wherein the biodegradable coating composition has a Young's modulus of greater than 700 MPa, an elongation at break of 10% to 300%, and a Water Vapor Transmission Rate (WVTR) of less than 600 g mil/(m 2 day). Also disclosed in embodiments herein are methods of making biodegradable coated paper products. The method comprises providing a paper substrate, extrusion coating a layer onto the paper substrate to form a biodegradable coated paper product, wherein the lay