Synthetic leather for steering wheel cover having improved durability and method for preparing the same

Patent metadata

Field	Value
Publication number	US-2016129665-A1
Application number	US-201514886580-A
Country	US
Kind code	A1
Filing date	Oct 19, 2015
Priority date	Nov 7, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

The present invention relates to a synthetic leather for a steering wheel cover of a vehicle, and a method for preparing the same. The synthetic leather including a fiber base layer ( 101 ) including a microfiber nonwoven fabric, an urethane porous layer ( 102 ) formed on the fiber base layer, a polyurethane resin skin layer ( 104 ) formed on the urethane porous layer, and prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol, and an adhesive layer ( 103 ) for adhering the urethane porous layer and the skin layer.

First claim

What is claimed is:

1 . A synthetic leather for a steering wheel cover, comprising:
a fiber base layer containing a microfiber nonwoven fabric;
an urethane porous layer having micropores;
a polyurethane skin layer including a polyurethane resin prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol; and an urethane adhesive layer including an urethane-based adhesive for adhering the urethane porous layer and the polyurethane skin layer; wherein the fiber base layer, the urethane porous layer, the urethane adhesive layer and the polyurethane skin layer are laminated in consecutive order.

2 . The synthetic leather for a steering wheel cover of claim 1 , wherein, on a surface of the skin layer, a polyurethane surface treatment coating layer including a polyurethane resin prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol are further laminated.

3 . The synthetic leather for a steering wheel cover of claim 1 , wherein the microfiber nonwoven fabric has apparent density of about 0.35 to 0.8 g/cm 3 .

4 . The synthetic leather for a steering wheel cover of claim 1 , wherein the microfiber nonwoven fabric includes a thermoplastic resin selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) as an island component, and includes polylactic acid (PLA) having biodegradability as a sea component, wherein the island component is included in an amount of about 60 to 80% by weight based on the total weight of the microfiber nonwoven fabric and the sea component is included in an amount of about 15 to 40% by weight based on the total weight of the microfiber nonwoven fabric.

5 . The synthetic leather for a steering wheel cover of claim 1 , wherein a polyurethane resin included in the urethane porous layer is prepared by polymerizing an isocyanate compound, and a polyol compound containing polyester-based polyol having weight average molecular weight of about 1,000 to 6,000, polyether-based polyol having a weight average molecular weight of about 1,000 to 6,000 and polycarbonate-based polyol having a weight average molecular weight of about 1,000 to 6,000.

6 . The synthetic leather for a steering wheel cover of claim 5 , wherein the polyol compound includes the polyester-based polyol, the polyether-based polyol and the polycarbonate-based polyol in a weight ratio of about 10-60: about 20-80: about 5-60.

7 . The synthetic leather for a steering wheel cover of claim 1 , wherein the polyol compound of the polyurethane skin layer includes the polycarbonate-based polyol having a weight average molecular weight of about 800 to 3500, the fluorine-based polyol having a weight average molecular weight of about 200 to 4000 and the ester-based polyol having a weight average molecular weight of about 1000 to 3000.

8 . The synthetic leather for a steering wheel cover of claim 7 , wherein the polyol compound of the polyurethane skin layer includes the polycarbonate-based polyol, the fluorine-based polyol and the ester-based polyol in a weight ratio of about 70-95: about 1-10: about 1-20.

9 . The synthetic leather for a steering wheel cover of claim 2 , wherein the polyol compound of the polyurethane surface treatment coating layer includes the polycarbonate-based polyol having a weight average molecular weight of about 800 to 3500, the fluorine-based polyol having a weight average molecular weight of about 200 to 4000 and the ester-based polyol having a weight average molecular weight of about 1000 to 3000.

10 . The synthetic leather for a steering wheel cover of claim 9 , wherein the polyol compound of the polyurethane surface treatment coating layer includes the polycarbonate-based polyol, the fluorine-based polyol and the ester-based polyol in a weight ratio of about 70-95: about 1-10: about 1-20.

11 . A method for preparing synthetic leather for a steering wheel cover, comprising:
preparing a first sheet by forming an urethane porous layer having micropores on a fiber base layer containing a microfiber nonwoven fabric; forming a polyurethane skin layer by coating a polyurethane composition including a polyurethane resin prepared by polymerizing an isocyanate compound and a polyol compound including polycarbonate-based polyol, fluorine-based polyol and ester-based polyol on a release paper; preparing a second sheet by forming an adhesive layer on the skin layer; laminating the first sheet and the second sheet; and peeling off the release paper.

12 . The method for preparing synthetic leather for a steering wheel cover of claim 11 , further comprising, forming a polyurethane surface treatment coating layer by coating a polyurethane coating liquid on the surface of the skin layer from which the release paper is peeled off.

13 . The method for preparing synthetic leather for a steering wheel cover of claim 11 , wherein the microfiber nonwoven fabric has apparent density of about 0.35 to 0.8 g/cm 3 .

14 . The method for preparing synthetic leather for a steering wheel cover of claim 11 , wherein the microfiber nonwoven fabric includes a thermoplastic resin selected from the group consisting of polyamide (PA), polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) as an island component, and includes polylactic acid (PLA) having biodegradability as a sea component,
wherein the island component is included in an amount of about 60 to 80% by weight based on the total weight of the microfiber nonwoven fabric and the sea component is included in an amount of about 15 to 40% by weight based on the total weight of the microfiber nonwoven fabric.

15 . The method for preparing synthetic leather for a steering wheel cover of claim 11 , wherein a polyurethane resin included in the urethane porous layer is prepared by polymerizing an isocyanate compound and a polyol compound containing polyester-based polyol having a weight average molecular weight of about 1,000 to 6,000, polyether-based polyol having a weight average molecular weight of about 1,000 to 6,000 and polycarbonate-based polyol having a weight average molecular weight of about 1,000 to 6,000.

16 . The method for preparing synthetic leather for a steering wheel cover of claim 15 , wherein the polyol compound includes the polyester-based polyol, the polyether-based polyol and the polycarbonate-based polyol in a weight ratio of about 10-60: about 20-80: about 5-60.

17 . The method for preparing synthetic leather for a steering wheel cover of claim 11 , wherein the polyol compound of the polyurethane skin layer includes the polycarbonate-based polyol having a weight average molecular weight of about 800 to 3500, the fluorine-based polyol having a weight average molecular weight of about 200 to 4000 and the ester-based polyol having a weight average molecular weight of about 1000 to 3000.

18 . The method for preparing synthetic leather for a steering wheel cover of claim 17 , wherein the polyol compound of the polyurethane skin layer includes the polycarbonate-based polyol, the fluorine-based polyol and the ester-based polyol in a weight ratio of about 70-95: about 1-10: about 1-20.

19 . The method for preparing synthetic leather for a steering wheel cover of claim 12 , wherein a polyol compound of the polyurethane surface treatment coating layer includes polycarbonate-based polyol having a weight average

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Baiksan Co Ltd

Inventors

• Cho Hyun Dae
• Kwon Oh Deok
• Seo Won Jin
• Jeong Kie Youn
• Cha Yoon Jong
• Ahn Sung Deuk
• Hyun Tae Ho

Classifications

• B29C66/727

  being porous, e.g. foam · CPC title

• B32B27/10

  of paper or cardboard · CPC title

• B32B2307/30

  having particular thermal properties · CPC title

• B29C66/7292

  coated (B29C66/72941 takes precedence) · CPC title

• B32B2307/748

  Releasability · CPC title