Composition for forming intermediate film for laminated glass, intermediate film for laminated glass and laminated glass

• US 9,034,973 B2
• Filed: 06/15/2007
• Issued: 05/19/2015
• Est. Priority Date: 06/19/2006
• Status: Expired due to Fees

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Tsuda, Takashi, Shimada, Makiko
• Primary Examiner(s): Teskin, Fred M
• Assistant Examiner(s): REDDICK, MARIE L
• Application Number:
  US12/305,257
• Publication Number:
  US 20100009205A1
• Time in Patent Office: 2,895 Days
• Field of Search: 428/442, 524/533, 524/529, 525/55, 525/242, 525/303
• US Class Current: 524/533
• CPC Class Codes: B32B 17/10788 containing ethylene vinylacetate
• CPC Class Codes: C08G 65/3322 acyclic
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/103 with polyalcohols
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 2666/22 Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: C09J 123/0853 Vinylacetate
• CPC Class Codes: C09J 171/02 Polyalkylene oxides
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer

Abstract

The object of the present invention is to provide an intermediate film for laminated glass which prevents reductions of transparency and appearance property caused by permeation of moisture and water. The above object is attained by the present invention, i.e., a composition for forming an intermediate film for a laminated glass which comprises ethylene-vinyl acetate copolymer and a compound having alkyleneoxy group. The composition of the present invention enables the formation of an intermediate film for a laminated glass that restrains white spots from occurring by the permeation of moisture and water.

Claims

1. A composition for forming an intermediate film for a laminated glass comprising an ethylene-vinyl acetate copolymer and a compound having an alkyleneoxy group, wherein the compound having an alkyleneoxy group has the following formula (1):

2. The composition for forming an intermediate film for a laminated glass as defined in claim 1, wherein R² represents an ethylene group or —

CH₂CH(CH₃)—

.

3. The composition for forming an intermediate film for a laminated glass as defined in claim 1, wherein n is an integer of from 2 to 20.

4. The composition for forming an intermediate film for a laminated glass as defined in claim 1, wherein R¹ is an alkoxyl group having 1 to 10 carbon atoms or an aryloxy group having 6 to 20 carbon atoms.

5. The composition for forming an intermediate film for a laminated glass as defined in claim 1, wherein the compound having an alkyleneoxy group is methoxy polyethyleneglycol(meth)acrylate (n=4 to 15).

6. The composition for forming an intermediate film for a laminated glass as defined in claim 1, wherein the compound having an alkyleneoxy group is contained in the amount of 0.01 to 5 parts by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

7. The composition for forming an intermediate film for a laminated glass as defined in claim 1, which further comprises 2-hydroxyethyl acrylate.

8. The composition for forming an intermediate film for a laminated glass as defined in claim 7, wherein 2-hydroxyethyl acrylate is contained in an amount in the range of 0.01 to 5 parts by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

9. The composition for forming an intermediate film for a laminated glass as defined in claim 1, the content of vinyl acetate recurring unit of the ethylene-vinyl acetate copolymer is in the range of 20 to 35 parts by weight based on 100 parts by weight of ethylene-vinyl acetate copolymer.

10. An intermediate film for a laminated glass obtained by molding in the form of a sheet the composition for forming an intermediate film for a laminated glass as defined in claim 1.

11. A laminated glass obtained by inserting the intermediate film for laminated glass as defined in claim 10 between two transparent substrates to be cross-linked and combined with each other.