KR-20260062311-A - Multilayer Polybuthylene Adipate Terephthalate Nonwovens And Method For Producing The Same

Abstract

The present invention relates to a multilayer polybutylene adipate terephthalate nonwoven fabric formed by laminating and bonding at least two layers of polybutylene adipate terephthalate nonwoven fabric, having an embossing rate of 5 to 30% based on area.

Inventors

• 윤광중
• 권오혁

Assignees

• 주식회사 휴비스

Dates

Publication Date

20260507

Application Date

20241029

Claims (9)

1. A multilayer polybutylene adipate terephthalate nonwoven fabric formed by laminating and bonding at least two layers of polybutylene adipate terephthalate nonwoven fabric, having an embossing rate of 5 to 30% based on area.
2. In paragraph 1, A multilayer polybutylene adipate terephthalate nonwoven fabric characterized in that the above-mentioned polybutylene adipate terephthalate nonwoven fabric is a polybutylene adipate terephthalate long fiber nonwoven fabric.
3. In paragraph 1, The above-mentioned polybutylene adipate terephthalate nonwoven fabric is a multilayer polybutylene adipate terephthalate nonwoven fabric characterized by being a polybutylene adipate terephthalate long fiber spunbond nonwoven fabric.
4. In paragraph 1, The above-described polybutylene adipate terephthalate nonwoven fabric is a multilayer polybutylene adipate terephthalate nonwoven fabric characterized by being composed of fiber filaments with a diameter of 10 to 30 μm.
5. In paragraph 1, The above-described polybutylene adipate terephthalate nonwoven fabric is a multilayer polybutylene adipate terephthalate nonwoven fabric characterized by having a unit weight of 10 to 200 g/ m² .
6. In paragraph 1, The above-described polybutylene adipate terephthalate nonwoven fabric is a multilayer polybutylene adipate terephthalate nonwoven fabric characterized by having a hysteresis moment of 0.003 to 0.008 gf cm/cm.
7. In Article 1, The above polybutylene adipate terephthalate nonwoven fabric is a multilayer polybutylene adipate terephthalate nonwoven fabric characterized by containing 2 to 40 wt% calcium carbonate.
8. (S1) A step of forming a polybutylene adipate terephthalate nonwoven fabric using polybutylene adipate terephthalate pellets; (S2) A step of further forming a polybutylene adipate terephthalate nonwoven fabric on one or both sides of a polybutylene adipate terephthalate nonwoven fabric to obtain a multilayer polybutylene adipate terephthalate nonwoven fabric having two or more layers of polybutylene adipate terephthalate nonwoven fabric laminated thereon; and (S3) A step of embossing the above multilayer polybutylene adipate terephthalate nonwoven fabric with a compression roller. Method for manufacturing a multilayer polybutylene adipate terephthalate nonwoven fabric as described in claim 1.
9. In paragraph 8, A method for manufacturing a multilayer polybutylene adipate terephthalate nonwoven fabric, characterized in that the polybutylene adipate terephthalate pellets have a melt index in the range of 12 to 50 g/10 min and a density in the range of 1.10 to 1.30 g/ cm³ .

Description

Multilayer Polybutylene Adipate Terephthalate Nonwovens and Method for Producing the Same The present invention relates to a multilayer polybutylene adipate terephthalate nonwoven fabric and a method for manufacturing the same. More specifically, the invention relates to a multilayer polybutylene adipate terephthalate nonwoven fabric and a method for manufacturing the same that can be used in various applications requiring soft characteristics due to contact with the body, such as hygiene products like diapers, adult diapers, sanitary pads, and wet wipes, as well as surgical gowns and protective clothing. Although disposable products are being consumed across various industries for diverse purposes, their non-biodegradability is raising environmental concerns, leading to an increasing demand for biodegradable nonwoven fabrics that decompose upon landfilling. To manufacture such biodegradable nonwoven fabrics, the use of biodegradable nonwoven fabrics made of biodegradable polymers has long been proposed. In particular, biodegradable nonwoven fabrics formed from aliphatic polyesters such as polylactic acid (PLA), polyethylene succinate (PES), polybutylene succinate (PBS), and polycaprolactone (PCL) possess properties comparable to versatile synthetic fibers and are widely used as biodegradable nonwoven fabrics by leveraging these properties. Patent Document 1 (Korean Patent Publication No. 특2001-0009196, published February 5, 2001) proposes a nonwoven fabric manufactured by spunbonding long fibers composed of a PLA polymer having a melting point of 100°C or higher or a copolymer with a hydrocarboxylic acid. However, polylactic acid (PLA) resin lacks flexibility and softness, making it difficult to use in applications requiring softness. To address these issues, it has been proposed to optimize the physical properties of a biodegradable resin composition by blending PLA resin with other biodegradable resins such as PBS, PBSA, or PBAT, and to manufacture long fibers or nonwoven fabrics by spinning the composition. However, due to the high crystallinity of PLA resin, it lacks compatibility with other resins, resulting in a problem where PLA resin blends suffer from poor moldability or spinnability. FIG. 1a is a cross-sectional view of a multilayer polybutylene adipate terephthalate nonwoven fabric composed of two layers of polybutylene adipate terephthalate nonwoven fabric according to one embodiment of the present invention. FIG. 1b is a cross-sectional view of a multilayer polybutylene adipate terephthalate nonwoven fabric composed of three layers of polybutylene adipate terephthalate nonwoven fabric according to one embodiment of the present invention. FIG. 2a is a schematic diagram showing an apparatus for manufacturing a multilayer polybutylene adipate terephthalate nonwoven fabric composed of two layers of polybutylene adipate terephthalate nonwoven fabric according to one embodiment of the present invention. FIG. 2b is a schematic diagram showing an apparatus for manufacturing a multilayer polybutylene adipate terephthalate nonwoven fabric composed of three layers of polybutylene adipate terephthalate nonwoven fabric according to one embodiment of the present invention. The present invention will be described in detail below. According to one embodiment of the present invention, a multilayer polybutylene adipate terephthalate nonwoven fabric is provided, which is formed by laminating and bonding at least two plies or at least two layers of polybutylene adipate terephthalate nonwoven fabric and has an embossing rate of 5 to 30% based on the total surface area. In the present specification, the term "polybutylene adipate terephthalate nonwoven fabric" refers to a component constituting a multilayer polybutylene adipate terephthalate nonwoven fabric. In the present invention, at least two layers of the polybutylene adipate terephthalate nonwoven fabric are physically bonded through a process such as embossing to form a final product, a multilayer polybutylene adipate terephthalate nonwoven fabric. In the present specification, unless otherwise specified, "polybutylene adipate terephthalate nonwoven fabric" is understood to mean a single layer polybutylene adipate terephthalate nonwoven fabric. In addition, the term ‘multilayer polybutylene adipate terephthalate nonwoven fabric’ in this specification is understood to mean a form formed by laminating or laminating two or more layers of ‘polybutylene adipate terephthalate nonwoven fabric’ unless otherwise specified. In the present specification, ‘two layers’ and ‘two layers’ or ‘three layers’ and ‘three layers’ are meant to be interchangeable. The polybutylene adipate terephthalate nonwoven fabric of the present invention may be a polybutylene adipate terephthalate long fiber nonwoven fabric, and preferably may be a polybutylene adipate terephthalate long fiber spunbond nonwoven fabric. In one embodiment according to the present invention, the polybutylene adi