Microorganism-resistant, single-component RTV organopolysiloxane compositions
AssigneeRhone-Poulenc Specialites Chimiques
InventorsGeorges Favre, Patrice Perrin
Life of this patent
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Abstract
Microorganism-resistant, storage-stable, single-component room temperature vulcanizable organopolysiloxane compositions, especially adapted as sealants, are comprised of: (A) 100 parts of an .alpha.,.omega.-dihydroxydiorganopolysiloxane polymer; (B) 2 to 25 parts of an organosilane; (C) 5 to 200 parts of inorganic filler material; (D) 0.0003 to 15 parts of a hardening catalyst; and (E) 0.01 to 1.2% by weight, based upon the total weight of the composition, of at least one fungicidal tetraalkylthiuram disulfide.
Claims6
A storage-stable, single-component RTV organopolysiloxane composition, comprising:
- (A) 100 parts of an .alpha.,.omega.-dihydroxydiorganopolysiloxane polymer, having a viscosity of 700 to 1,000,000 mPa.s at 25.degree. C., comprising diorganosiloxy recurring units of the formula R.sub.2 SiO in which the symbols R, which may be identical or different, are hydrocarbon radicals containing from 1 to 8 carbon atoms, or halo or cyano substituted such hydrocarbon radicals;
- (B) 2 to 25 parts of an organosilane of the formula R.sub.a Si(Z).sub.4-a in which the symbol R is as above defined, and the symbols Z, which may be identical or different, are selected from among the hydrolyzable radicals of the formulae:
- ##STR14## in which:
- (i) the symbol R.sup.1 is an alkyl radical containing from 1 to 4 carbon atoms, or a .beta.-methoxyethyl radical of the formula --CH.sub.2 CH.sub.2 OCH.sub.3 ;
- (ii) the symbol R.sup.2 is a hydrocarbon radical devoid of aliphatic unsaturation and containing from 1 to 15 carbon atoms;
- (iii) the symbols R.sup.3, which may be identical or different, are alkyl radicals containing from 1 to 5 carbon atoms;
- (iv) the symbols R.sup.4, which may be identical or different, are hydrocarbon radicals devoid of aliphatic unsaturation and containing from 1 to 10 carbon atoms;
- (v) the symbol X is an alkylene radical containing from 3 to 7 carbon atoms;
- and `(vi) the symbol a is zero or one;
- (C) 5 to 200 parts of inorganic filler material;
- (D) 0.0003 to 15 parts of a hardening catalyst comprising iron and titanium chelates, the tin, iron or lead salts of carboxylic acids, organotin salts of carboxylic acids, alkyl titanates and zirconates, or the products of reaction of organotin salts of carboxylic acids with alkyl titanates;
- and
- (E) 0.01 to 1.2% by weight, based upon the total weight of the composition, of at least one fungicidal tetraalkylthiuram disulfide having the formula (I):
- ##STR15## in which the radicals Y, which may be identical or different, are alkyl radicals containing from 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.