Process for the manufacture of a polymeric material containing i

Details Process for the manufacture of a polymeric material containing i Process for the manufacture of a polymeric material containing i

1993-03-19

1995-06-13

Dean, Ralph H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525100, 525903, 528 25, 528 26, C08F78312

Patent

active

054243750

ABSTRACT:
The polysiloxane network (1) of this polymeric material is formed by (1a) at least one .alpha.,.omega.-dihydroxylated polydimethylsiloxane and/or an .alpha.,.omega.-dihydroxylated poly(dimethyldiphenyl)siloxane containing at least 70% of dimethylsiloxane units; (1b) a crosslinking agent and/or a bridging agent ensuring the crosslinking as well as a bond between the networks; optionally (1c) a polycondensation catalyst. The acrylic network (2) is formed by (2a) at least one (meth)acrylic monomer containing no hydrophilic functional group; optionally (2b) a crosslinking agent and (2c) a radical polymerization initiator. The polymerization mixture contains all these constituents and sufficient inhibitor of free radical formation to prevent, at the outset, the initiator (2c) producing radicals which, combined with the catalyst (1c) would annihilate the catalytic properties of the latter, to form the network (1) before the network (2). Application: manufacture of articles of all shapes.

REFERENCES:
patent: 4302553 (1981-11-01), Frisch et al.
patent: 4322517 (1982-03-01), Deubzer et al.
patent: 4618644 (1986-10-01), Liu
patent: 4894415 (1990-01-01), Sasaki
patent: 5006581 (1991-04-01), Nakane et al.
Concise Encyclopedia of Polymer Science and Engineering, 1990, pp. 489-492; 644-645.
X. W. He et al., "Polydimethylsiloxane/poly(methyl methacrylate) Interpenetrating Polymer Networks: 2. Synthesis and Properties," Polymer, 33(4), 1992, 866-871.

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