Flame-retardant adhesive composition, coverlay film using same, and flexible copper-clad laminate

Patent metadata

Field	Value
Publication number	US-2016222192-A1
Application number	US-201415022630-A
Country	US
Kind code	A1
Filing date	Sep 8, 2014
Priority date	Sep 20, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

The flame-retardant adhesive composition contains a styrene-based elastomer containing a carboxyl group, an epoxy resin, and a phosphorus-containing oligomer including a structural unit represented by general formula (1), and the epoxy resin content is 1-20 parts by mass and the phosphorus-containing oligomer content is 10-50 parts by mass with respect to 100 parts by mass of the styrene-based elastomer containing carboxyl groups.

(wherein, R 1 and R 2 are each independently a hydrogen atom or a methyl group, n is an integer of 1-20.)

First claim

1 . A flame-retardant adhesive composition comprising (A) a carboxyl group-containing styrene-based elastomer, (B) an epoxy resin, and (C) a phosphorus-containing oligomer having a structural unit represented by a formula (1),
wherein a content of the epoxy resin (B) is in a range from 1 to 20 parts by mass, and a content of the phosphorus-containing oligomer (C) is in a range from 10 to 50 parts by mass based on 100 parts by mass of a content of the carboxyl group-containing styrene-based elastomer (A)

wherein R 1 and R 2 are each independently a hydrogen atom or a methyl group, and n is an integer of 1 to 20.

2 . The flame-retardant adhesive composition according to claim 1 ,
wherein an acid value of the carboxyl group-containing styrene-based elastomer (A) is in a range from 0.1 to 20 mgKOH/g.

3 . The flame-retardant adhesive composition according to claim 1 ,
wherein a main chain chemical structure of the carboxyl group-containing styrene-based elastomer (A) is derived from at least one styrene-based elastomer selected from the group consisting of a styrene-butadiene block copolymer, a styrene-ethylene propylene block copolymer, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a styrene-ethylene butylene-styrene block copolymer, and a styrene-ethylene propylene-styrene block copolymer.

4 . The flame-retardant adhesive composition according to claim 1 ,
wherein a weight-average molecular weight of the phosphorus-containing oligomer (C) is in a range from 1000 to 10000.

5 . The flame-retardant adhesive composition according to claim 1 ,
wherein a phosphorus concentration in the flame-retardant adhesive composition is in a range from 0.7% to 3% by mass based on 100% by mass of a solid content of the flame-retardant adhesive composition.

6 . A coverlay film comprising an adhesive layer comprising the flame-retardant adhesive composition according to claim 1 ,
wherein the adhesive layer is formed onto one surface of a polyimide film or an aramid film.

7 . A flexible copper-clad laminated board wherein a copper foil is laminated onto one surface of a polyimide film or an aramid film with the flame-retardant adhesive composition according to claim 1 .

8 . A bonding sheet comprising an adhesive layer comprising the flame-retardant adhesive composition according to claim 1 ,
wherein the adhesive layer is formed onto one surface of a releasable film.

Assignees

• Toagosei Co Ltd

Inventors

• Takashima Masaru
• OKIMURA Yuya
• Yamada Mesashi

Classifications

• C09J109/06 Primary

  Copolymers with styrene · CPC title

• H05K3/285

  Permanent coating compositions · CPC title

• B32B2307/306

  Resistant to heat · CPC title

• C09J2479/086

  in the substrate · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title