Porous poly(vinyl acetal) object and nonwoven poly(vinyl acetal) fabric

Patent metadata

Field	Value
Publication number	US-10696812-B2
Application number	US-201716095820-A
Country	US
Kind code	B2
Filing date	Jul 19, 2017
Priority date	Jul 20, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The present invention aims to provide a porous polyvinyl acetal object and a nonwoven polyvinyl acetal fabric each capable of exhibiting significantly high shock absorption. Provided is a porous polyvinyl acetal object having a large number of cells, including: a polyvinyl acetal; and a plasticizer, the porous object having an open cell ratio of 10% or higher, the porous object in the form of a sample with a size of 10 cm in length, 10 cm in width, and 4 mm in thickness having a coefficient of rebound (rebounding height/drop height) of 0.1 or lower in measurement of a rebounding height of a ½-inch SUS ball in conformity with JIS B 1501 dropped from a given drop height to the center of the sample placed on an iron plate with a size of 10 cm or more in length, 10 cm or more in width, and 1 cm in thickness.

First claim

The invention claimed is:

1. A porous polyvinyl acetal object having a large number of cells, comprising:
a polyvinyl acetal; and
a plasticizer,
the porous object having an open cell ratio of 10% or higher,
the porous object in the form of a sample with a size of 10 cm in length, 10 cm in width, and 4 mm in thickness having a coefficient of rebound (rebounding height/drop height) of 0.1 or lower in measurement of a rebounding height of a ½-inch SUS ball in conformity with JIS B 1501 dropped from a given drop height to the center of the sample placed on an iron plate with a size of 10 cm or more in length, 10 cm or more in width, and 1 cm in thickness.

2. The porous polyvinyl acetal object according to claim 1 ,
wherein the open cell ratio is 14% or higher.

3. The porous polyvinyl acetal object according to claim 1 ,
wherein the cells have an average cell size of 100 to 1,000 μm.

4. The porous polyvinyl acetal object according to claim 1 ,
wherein the cells have an average aspect ratio of 2 or less.

5. The porous polyvinyl acetal object according to claim 1 ,
wherein the specific gravity thereof is 0.3 or less.

6. The porous polyvinyl acetal object according to claim 1 , which is foamed with a heat-decomposable foaming agent.

7. A sound insulation material comprising the porous polyvinyl acetal object according to claim 1 .

8. A vibration absorption material comprising the porous polyvinyl acetal object according to claim 1 .

9. A shock absorption material comprising the porous polyvinyl acetal object according to claim 1 .

10. A nonwoven polyvinyl acetal fabric comprising a fiber containing a polyvinyl acetal and a plasticizer,
the nonwoven fabric having a weight per unit area of 100 to 800 g/m 2 ,
the nonwoven fabric in the form of a sample with a size of 10 cm in length, 10 cm in width, and 4 mm in thickness having a coefficient of rebound (rebounding height/drop height) of 0.1 or lower in measurement of a rebounding height of a ½-inch SUS ball in conformity with JIS B 1501 dropped from a given drop height to the center of the sample placed on an iron plate with a size of 10 cm or more in length, 10 cm or more in width, and 1 cm in thickness.

11. A sound insulation material comprising the nonwoven polyvinyl acetal fabric according to claim 10 .

12. A vibration absorption material comprising the nonwoven polyvinyl acetal fabric according to claim 10 .

13. A shock absorption material comprising the nonwoven polyvinyl acetal fabric according to claim 10 .

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Takahashi Katsunori

Classifications

• C08K5/103

  with polyalcohols · CPC title

• C08J9/0023 Primary

  containing oxygen · CPC title

• C08J9/06

  by a chemical blowing agent · CPC title

• C08J9/103 Primary

  Azodicarbonamide · CPC title

• C08J2205/04

  characterised by the foam pores · CPC title