Ultraviolet-curable organopolysiloxane composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

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522 60, 522 62, 522 99, 528 12, 528 21, 528 24, 528 30, 528 32, C08G 7744, C08G 7720

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active

048107310

ABSTRACT:
Whereas the mechanism for the crosslink formation in the curable organopolysiloxane composition of the invention is the ultraviolet-induced addition reaction between alkenyl, e.g., vinyl, groups in a diorganopolysiloxane and mercaptoalkyl groups in another organopolysiloxane as in conventional compositions, the mercaptoalkyl-containing organopolysiloxane used in the invention is, differently from those in conventional compositions, an organopolysiloxane of a three-dimensionally branched molecular structure as composed of the siloxane units of the formulas R.sup.1.sub.3 SiO.sub.0.5, R.sup.1.sub.a (HSR.sup.2)SiO.sub.(3-a)/2 and SiO.sub.2, in which R.sup.1 is, for example, a methyl or phenyl group, R.sup.2 is, for example, --CH.sub.2 CH.sub.2 CH.sub.2 -- and a is zero, 1 or 2, in a specified proportion. In addition, the vinyl group-containing siloxane units in the vinyl-containing diorganopolysiloxane are localized in the molecular structure forming two blocks each bonded to one of the terminal silicon atoms. The inventive composition is advantageous in respect of the greatly improved mechanical strengths of the cured silicone rubber obtained by irradiating the composition with ultraviolet light.

REFERENCES:
patent: 3337497 (1967-08-01), Bostick
patent: 4045390 (1977-08-01), Itoh
patent: 4163082 (1979-07-01), Romenesko

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