# US 5,705,275 A · Thermosetting resin composition and two-parts composite body thereof with silicone rubber

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- Number: US 5,705,275 A
- Document ID: US5705275A
- Status: Granted
- Kind: A
- Application number: 08/758,398
- Filed: 1996-11-29
- Granted: 1998-01-06
- Earliest claimed: 1996-11-29
- Assignees: Shin-Etsu Polymer Co., Ltd.
- Inventors: Sadao Nakano; Susumu Iwama; Mikio Kiyosawa
- Web page: https://patentgrep.com/patent/US5705275A

## CPC

- B32B 25/08: of synthetic resin
- B32B 25/20: comprising silicone rubber
- B32B 27/26: using curing agents
- C08L 67/06: Unsaturated polyesters
- B32B 2037/0092: {in which absence of adhesives is explicitly presented as an advantage}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- H01H 2229/046: Multi-colour or double shot injection moulding
- Y10T 428/31511: Of epoxy ether
- Y10T 428/31536: Including interfacial reaction product of adjacent layers
- Y10T 428/31663: As siloxane, silicone or silane
- Y10T 428/31667: Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
- Y10T 428/31794: Of cross-linked polyester
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a novel thermosetting resin composition suitable for the preparation of an integrally molded two-parts composite body consisting of a first part of a cured silicone rubber and a second part of a cured thermosetting resin without intervention of an adhesive layer at the interface. The thermosetting resin composition comprises: (a) 100 parts by weight of an unsaturated polyester resin; (b) from 20 to 50 parts by weight of an ethylenically unsaturated polymerizable compound such as diallyl phthalate; (c) from 5 to 30 parts by weight of an epoxy resin; (d) from 2 to 20 parts by weight of a melamine resin; (e) from 0.1 to 2 parts by weight of a radical-reactive curing agent which is an organic peroxide; and (f) from 0.1 to 2 parts by weight of an acidic catalyst such as aromatic sulfonic acid derivatives.

## Claims

### Claim 1

A two-parts composite body which is an integral body consisting of:
(A) a first cured part molded from a silicone rubber composition, of which the organopolysiloxane molecules have at least one vinyl group bonded to the silicon atom in a molecule; and
(B) a second cured part molded from a thermosetting resin composition comprising, as a uniform blend:
(a) 100 parts by weight of an unsaturated polyester resin;
(b) from 20 to 50 parts by weight of an ethylenically unsaturated polymerizable compound;
(c) from 5 to 30 parts by weight of an epoxy resin;
(d) from 2 to 20 parts by weight of a melamine resin;
(e) from 0.1 to 2 parts by weight of a radical-reactive curing agent; and
(f) from 0.1 to 2 parts by weight of an acidic catalyst, the first part and the second part being joined together without intervention of a layer of an adhesive at the interface.

### Claim 2 (depends on 1)

The two-parts composite body as claimed in claim 1 in which the first part of a silicone rubber as the part (A) has a Shore A hardness in the range from 30 to 80 and the second part of a thermosetting resin as the part (B) has a Shore D hardness of 60 or higher.