# US 12,214,572 B2 · Modified vinyl acetal resin for interlayer film of laminated glass

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- Number: US 12,214,572 B2
- Document ID: US12214572B2
- Status: Granted
- Kind: B2
- Application number: 17/440,815
- Filed: 2020-03-18
- Published: 2022-06-16
- Granted: 2025-02-04
- Earliest claimed: 2019-03-28
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Takuro Niimura; Akio Takasugi; Atsuhiro Nakahara; Yoshiaki Asanuma
- Web page: https://patentgrep.com/patent/US12214572B2

## CPC

- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10: of synthetic resin
- B32B 17/10036: {comprising two outer glass sheets}
- C08F 8/28: Condensation with aldehydes or ketones
- C08F 210/02: Ethene
- C08F 216/06: Polyvinyl alcohol {; Vinyl alcohol}
- C08F 216/38: by an acetal or ketal radical
- C08J 5/18: Manufacture of films or sheets
- C08K 5/103: with polyalcohols
- B32B 2250/03: 3 layers
- B32B 2307/306: Resistant to heat
- B32B 2307/412: Transparent
- B32B 2307/558: Impact strength, toughness
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2329/14: Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The problem to be solved of the present invention is to provide a modified vinyl acetal resin for an interlayer film of laminated glass having excellent transparency, impact resistance, heat resistance and molding ability. The means for solving the problem is a modified vinyl acetal resin for an interlayer film of laminated glass comprising 25 to 60 mol % of ethylene units and 24 to 71% by mol of vinyl alcohol units, based on all the monomer units constituting the resin, and having the acetalization degree of 5 mol % or more and less than 40 mol %.

## Claims

### Claim 1

A laminated glass, comprising:
two glass plates and
an interlayer film arranged between the two glass plates wherein the sheet shaped article has
wherein
the interlayer film comprises a sheet shaped article containing a resin composition, which comprises 80% by mass or more of a modified vinyl acetal resin;
the modified vinyl acetal resin contains 27 to 48 mol % of ethylene units, 36 to 57 mol % of vinyl alcohol units, and 16 to 28 mol % of acetalized vinyl alcohol units, based on all monomer units constituting the modified vinyl acetal resin;
the modified vinyl acetal resin is produced through an acetalization reaction of an aldehyde with an ethylene vinyl alcohol copolymer;
the aldehyde is only one or more aldehydes selected from the group consisting of formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, hexylaldehyde, benzaldehyde (C6H5CHO), isobutylaldehyde, 2-ethylhexylaldehyde, 2-methylbutylaldehyde, trimethylacetaldehyde, 2-methylpentylaldehyde, 2,2-dimethylbutylaldehyde, 2-ethylbutylaldehyde, and 3,5,5-trimethylhexylaldehyde; and the modified vinyl acetal resin has an acetalization degree of 5 mol % or more and less than 40 mol %, where the acetalization degree is defined as a ratio of the acetalized vinyl alcohol units out of all the monomer units other than the ethylene units.

### Claim 2 (depends on 1)

The laminated glass according to claim 1, wherein the acetalization degree of the modified vinyl acetal resin is 10 mol % or more and 36 mol % or less.

### Claim 3 (depends on 1)

The laminated glass according to claim 1, wherein the modified vinyl acetal resin contains the vinyl alcohol units in an amount of 38 mol % or more and 57 mol % or less.

### Claim 4 (depends on 1)

The laminated glass according to claim 1, wherein the sheet shaped article has a thickness of 0.10 to 3 mm.

### Claim 5 (depends on 1)

The laminated glass according to claim 1, wherein the sheet shaped article has
wherein
the interlayer film comprises a sheet shaped article containing a resin composition, which comprises 80% by mass or more of a modified vinyl acetal resin;
the modified vinyl acetal resin contains 27 to 48 mol % of ethylene units, 36 to 57 mol % of vinyl alcohol units, and 16 to 28 mol % of acetalized vinyl alcohol units, based on all monomer units constituting the modified vinyl acetal resin;
the modified vinyl acetal resin is produced through an acetalization reaction of an aldehyde with an ethylene vinyl alcohol copolymer;
the aldehyde is only one or more aldehydes selected from the group consisting of formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, hexylaldehyde, benzaldehyde (C6H5CHO), isobutylaldehyde, 2-ethylhexylaldehyde, 2-methylbutylaldehyde, trimethylacetaldehyde, 2-methylpentylaldehyde, 2,2-dimethylbutylaldehyde, 2-ethylbutylaldehyde, and 3,5,5-trimethylhexylaldehyde; and
the modified vinyl acetal resin has an acetalization degree of 5 mol % or more and less than 40 mol %, where the acetalization degree is defined as a ratio of the acetalized vinyl alcohol units out of all the monomer units other than the ethylene units a storage elastic modulus E′ at a temperature of 50° C. and a frequency of 1 Hz of 20 to 1,000 MPa.

### Claim 6 (depends on 1)

The laminated glass according to claim 1, wherein the resin composition further comprises 1% by mass or less of a plasticizer.