Alkoxy functional resins and compositions containing them

Details Alkoxy functional resins and compositions containing them Alkoxy functional resins and compositions containing them

1990-01-10

1992-01-07

Marquis, Melvyn I.

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

Synthetic resins

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

528 15, 528 18, C08F28300

Patent

active

050793110

ABSTRACT:
This invention discloses MQ silicone resins having tetravalent units of the formula SiO.sub.2 and monovalent units of the formula R.sub.a R'.sub.3-a SiO.sub.1/2 wherein R' denotes a group of the general formula --R"Si(OR.sup.*).sub.3 with R" being an alkylene group and R.sup.* an alkyl group and wherein a has a value of 2 or 3, preferably 2 for up to 30% of all monovalent units. There is also described a method of making these resins and a composition comprising hydroxy end-blocked polydiorganosiloxanes, MQ resins of the invention and a catalyst. This gives elastomer-forming compositions which have low viscosity in the uncured state whilst retaining good physical properties when cured.

REFERENCES:
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patent: 2676182 (1954-02-01), Daudt et al.
patent: 3647846 (1972-04-01), Hartlein et al.
patent: 3884866 (1975-09-01), Jeram et al.
patent: 3957713 (1976-08-01), Jeram et al.
patent: 4143088 (1979-10-01), Faure et al.
patent: 4465805 (1984-08-01), Blizzard et al.
patent: 4772675 (1988-09-01), Klowsowski et al.
patent: 4774310 (1988-07-01), Butler
patent: 4849491 (1989-07-01), Ogawa et al.

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