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US 5,962,583 AGranted
Oil resistant silicone sealants
AssigneeDow Corning Corporation
InventorsPhilip David Beljanski, Loren Dale Lower
Life of this patent
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Abstract
The invention relates to a RTV silicone composition having increased hot oil resistance upon curing. The RTV silicone composition comprises a polydiorganosiloxane, an acyloxy-functional crosslinker, a metal salt of a carboxylic acid catalyst, a filler, and a metal acetylacetonate. In a preferred embodiment a metal oxide is also added.
Claims10
A RTV silicone composition which is curable in the presence of moisture, comprising:
- (A) 100 parts by weight of a polydiorganosiloxane in which the terminal groups are selected from the group consisting of silanol and triorganosilyl groups, provided at least 60 mole percent of the terminal groups are silanol groups;
- (B) 1 to 15 parts by weight of an acyloxy-functional crosslinking agent described by the formula
- R.sub.m Si(OCOR').sub.4-m
- where R is a monovalent hydrocarbon radical comprising from 1 to about 12 carbon atoms, each R' is an independently selected monovalent hydrocarbon radical comprising from 1 to about 12 carbon atoms, and m is 0 or 1;
- (C) 0.001 to 1 part by weight of a metal salt of a carboxylic acid catalyst;
- (D) 5 to 150 parts by weight of a filler;
- and
- (E) an amount of a metal acetylacetonate effective for providing increased hot oil resistance to the RTV silicone composition upon curing, where the metal portion of the metal acetylacetonate is selected from the group consisting of copper, chromium, iron, aluminum, zinc, titanium and zirconium.
5 more elements
Dependencies are inferred from the claim text.