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CN-121986138-A - Composition containing silane-treated calcium carbonate

CN121986138ACN 121986138 ACN121986138 ACN 121986138ACN-121986138-A

Abstract

Sealants, adhesives and rubber compositions may comprise a polymer matrix and silane-treated calcium carbonate to provide compositions having improved mechanical properties.

Inventors

  • Brandon Hu Chaluk

Assignees

  • 特种矿物(密执安)有限公司

Dates

Publication Date
20260505
Application Date
20241010
Priority Date
20231012

Claims (20)

  1. 1. A sealant composition comprising: A polymer matrix, and A filler comprising silane-treated calcium carbonate, wherein the sealant has improved mechanical properties.
  2. 2. The sealant composition of claim 1, wherein the polymer matrix comprises a silicone or modified silicone polymer.
  3. 3. The sealant according to claim 1 or 2, wherein the silane is a trialkoxysilane, an organosilane or an aminosilane.
  4. 4. A sealant composition according to any one of claims 1 to 3, wherein the calcium carbonate is precipitated calcium carbonate.
  5. 5. The sealant of any one of claims 1-4, wherein the silane-treated calcium carbonate is present in an amount of about 10% to about 50% based on the total weight of the polymer matrix.
  6. 6. The sealant of any one of claims 1-5, wherein the calcium carbonate has an average particle size of about 10nm to about 300 nm.
  7. 7. The sealant of any one of claims 1-6, wherein the calcium carbonate has an average surface area of about 10m 2 /g to about 125m 2 /g.
  8. 8. The sealant according to any one of claims 1 to 7, wherein the tensile strength of the composition is at least 70% greater than the tensile strength of a composition comprising the polymer matrix and a filler comprising calcium carbonate surface treated with fatty acid.
  9. 9. The sealant according to any one of claims 1 to 8, wherein the modulus of elasticity of the composition is at least 70% greater than the modulus of a composition comprising the polymer matrix and a filler comprising calcium carbonate surface treated with fatty acid.
  10. 10. The sealant according to claim 8 or 9, wherein the fatty acid is stearic acid.
  11. 11. An adhesive composition comprising: Adhesive matrix, and A filler comprising silane-treated calcium carbonate.
  12. 12. The adhesive composition of claim 11, wherein the adhesive matrix comprises silicone, epoxy, polyurethane, and an adhesive, optionally a pitch adhesive and a pitch-based adhesive.
  13. 13. The adhesive composition of claim 11 or 12, wherein the calcium carbonate is precipitated calcium carbonate.
  14. 14. The adhesive composition of any one of claims 11 to 13, wherein the silane is a trialkoxysilane, an organosilane, or an aminosilane.
  15. 15. The adhesive composition of any one of claims 11-14, wherein the silane-treated calcium carbonate is present in an amount of about 10% to about 50% based on the total weight of the polymer matrix.
  16. 16. The adhesive composition of any one of claims 11-15, wherein the calcium carbonate has an average particle size of about 10nm to about 300 nm.
  17. 17. The adhesive composition of any one of claims 11-16, wherein the calcium carbonate has an average surface area of about 10m 2 /g to about 125m 2 /g.
  18. 18. The adhesive composition of any one of claims 11-17, wherein the tensile strength of the composition is at least 70% greater than the tensile strength of a composition comprising the polymer matrix and a filler comprising calcium carbonate surface treated with a fatty acid.
  19. 19. The adhesive composition of any one of claims 11-18, wherein the composition has an elastic modulus that is at least 70% greater than an elastic modulus of a composition comprising the polymer matrix and a filler comprising calcium carbonate surface treated with a fatty acid.
  20. 20. The adhesive composition of claim 18 or 19, wherein the fatty acid is stearic acid.

Description

Composition containing silane-treated calcium carbonate Cross Reference to Related Applications U.S. provisional application No. 63/543,853, filed on 10/12 at 2023, and U.S. patent application No. 63/596,936, filed on 11/7 at 2023, the disclosures of both of which are incorporated herein by reference in their entirety. Technical Field The present disclosure relates to compositions containing silane-treated calcium carbonate, and more particularly to sealant, rubber, and/or adhesive compositions containing silane-treated calcium carbonate as a filler. Background Calcium carbonate products have been used as fillers in sealants and rubbers. Typical calcium carbonates used as fillers in such products are fatty acid coated calcium carbonates. The nonpolar tails of the fatty acids can provide the necessary interactions and dispersion of the filler within the polymer matrix. Disclosure of Invention The compositions of the present disclosure comprise a polymer matrix and a filler comprising silane-treated calcium carbonate. The composition of the present disclosure may be a sealant, adhesive or rubber composition. The compositions of the present disclosure have significantly improved mechanical properties, such as tensile strength and/or elastic modulus, compared to compositions using fatty acid treated PCC as filler. Drawings Fig. 1 includes photographs showing a wafer-water (puck-water) test of silane-treated PCC according to the present disclosure. Fig. 2 is a graph showing comparative tensile strength testing of a composition according to the present disclosure and a control composition comprising stearic acid-treated PCC as filler. Fig. 3 is a graph showing comparative tensile stress at 300% elongation test for a composition according to the present disclosure and a control composition comprising stearic acid-treated PCC as filler. Fig. 4 is a graph showing comparative viscosity testing of compositions according to the present disclosure and control compositions comprising stearic acid-treated PCC as filler. Detailed Description The composition according to the present disclosure comprises a polymer matrix and a filler comprising silane-treated calcium carbonate. The calcium carbonate may be precipitated calcium carbonate. The composition may be a sealant composition, a rubber composition, or an adhesive composition. The compositions of the present disclosure may have a surprising improvement in mechanical properties compared to a composition having the same polymer matrix and filler comprising fatty acid treated calcium carbonate. The magnitude of the improvement in mechanical properties is surprising and unexpected in view of the expected interaction of silane-treated PCC with the polymer matrix and knowledge about the interaction of fatty acid-treated PCC with the polymer matrix. For example, an increase of 122% in sealant strength of the silicone-based polymer matrix and a 76% increase in sealant strength of the modified silicone-based polymer matrix was observed as compared to a sealant composition having the same base composition but comprising fatty acid treated PCC as filler. PCC itself has poor coupling interactions with polymer rubber, adhesives and sealants. This is due to the polar inorganic nature of calcium carbonate and the mostly non-polar nature of the polymer matrix. While not wanting to be bound by theory, it is believed that by silane treating the PCC, the silane acts as a coupling agent between the filler and the polymer matrix, forming a durable bond between the two materials. While it is expected that incorporating silane coated substrates into polymer matrices may improve dispersibility, hydrophobicity, polymer crosslinking, and provide some improvement in mechanical properties over compositions without fillers, the degree of improvement observed with the compositions of the present disclosure is greater than expected. Furthermore, based on previous knowledge of filler properties in the polymer matrix, it was not expected that calcium carbonate treated with silane would exhibit such a significant improvement in mechanical properties compared to fatty acid treated calcium carbonate. A sealant composition according to the present disclosure can include a polymer matrix and a filler containing silane-treated calcium carbonate. The polymer matrix of the sealant composition can be any known polymer matrix used in sealant compositions. For example, the substrate may be oil-based or resin-based. The polymer matrix of the sealant composition of the present disclosure may include, but is not limited to, silicones such as hydroxyl-terminated silicones and vinyl-terminated silicones, modified silicone polymers (i.e., polyether backbone polymers), butyl rubber, polyurethanes, polysulfides, epichlorohydrin, fluorocarbons, isoprene, neoprene, nitrile, polysulfide, epoxy resins, polyvinyl acetate (PVA), PVC plastisols, hydrocarbon rubber-based sealants, acrylic, chlorosulfonated polyethylene, syntheti