Coating composition

Details Coating composition Coating composition

1992-09-22

1994-03-01

Dean, Ralph H.

Coating processes

Applying superposed diverse coating or coating a coated base

Synthetic resin coating

427387, 525101, 525104, 525102, 524268, 524269, 524506, B29D 900, B32B 2730

Patent

active

052906019

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a primer composition for application to a substrate to promote adhesion of a room-temperature-vulcanisable (RTV) silicone rubber coating.
RTV silicone rubber coatings are applied to underwater surfaces, for example ships' hulls, the cooling water inlets and outlets of power stations, fish-farming equipment and the underwater and splash-zone surfaces of oil production platforms, to inhibit fouling by aquatic organisms such as algae and barnacles.


BACKGROUND OF THE INVENTION

Silicone rubber fouling-resistant coatings are described for example in GB-A-1307001, GB-A-1470465, GB-A-1581727, GB-A-2141436, EP-A-16195 and U.S. Pat. No. 3,702,778. RTV silicone rubber coatings have also been suggested as coatings inhibiting the adhesion of ice, for example on the superstructure and topsides of ships.
A problem in the use of such RTV silicone rubber coatings is that it is difficult to make them adhere well to substrates. This problem is discussed in EP-A-16195 which proposes applying the RTV silicone rubber as a cladding on a fabric backing.
Various primer compositions have been suggested for room-temperature-vulcanisable silicone rubber antifoulings. U.S. Pat. No. 3,702,778 proposes a crosslinkable silicone paste. EP-A-89066 proposes a mixture of an epoxysilane and a silane containing an unsaturated hydrocarbon group. JP-A-53-137231, JP-A-53-137233 and JP-A-53-137234 propose various elastomeric materials such as polyurethane, natural rubber, chloroprene or neoprene rubber or butyral/silicone rubber. EP-A-323906 and EP-A-329375 propose a silicone resin containing an aminosilane.
U.S. Pat. No. 4,070,421 describes the use of chlorinated polyethylene as a primer for improving adhesion of coatings on polyolefin surfaces.


SUMMARY OF THE INVENTION

A primer composition according to the invention for application to a substrate to promote adhesion of an RTV silicone rubber coating comprises: hydrocarbon radicals having 1 to 12 carbon atoms and optionally containing an ether linkage; R.sup.1 is an alkylene radical having 2 to 4 carbon atoms or a divalent aliphatic ether radical having 3 to 8 carbon atoms; R.sup.2 is hydrogen or an alkylene radical of 2 to 4 carbon atoms tipped with a primary amine group; and x is 2 or 3; or formula (I) with an epoxy-functional silane of the formula: to 12 carbon atoms; the radicals B, which can be the same or different, are alkyl radicals having 1 to 4 carbon atoms; and a is 0 or 1; or formula (I) with an alpha, omega-dihydroxypolydimethylsiloxane oil of the formula:


DETAILED DISCLOSURE

In the primary amine-functional silane of formula (I) the radicals R are preferably alkyl, for example methyl, ethyl, hexyl or octyl, aryl, for example phenyl, or aralkyl, for example benzyl. The alkylene radical R.sup.1 is preferably --(CH.sub.2).sub.3 --, --(CH.sub.2).sub.4 -- or methyl-substituted trimethylene, or can be --(CH.sub.2).sub.3 --O--(CH.sub.2).sub.2, --(CH.sub.2).sub.3 --O--(CH.sub.2).sub.3 -- or --CH.sub.2 --O--(CH.sub.2).sub.2 --. R.sup.2 is preferably hydrogen or --CH.sub.2 CH.sub.2 NH.sub.2. It may be preferred to separate any ether oxygen atom in R and R.sup.1 by at least two carbon atoms from the nearest heteroatom. Examples of primary amine-functional silanes of formula (I) are: (CH.sub.3 O).sub.3 Si(CH.sub.2).sub.3 NH(CH.sub.2).sub.2 NH.sub.2 ; (CH.sub.3 CH.sub.2 OCH.sub.2 CH.sub.2 O).sub.3 Si(CH.sub.2).sub.2 NH.sub.2 ; (C.sub.2 H.sub.5 O).sub.3 Si(CH.sub.2).sub.3 NH.sub.2 ; (CH.sub.3 OCH.sub.2 CH.sub.2 O).sub.3 Si(CH.sub. 2).sub.3 NH.sub.2 ; (C.sub.2 H.sub.5 O).sub.3 Si(CH.sub.2).sub.3 O(CH.sub.2).sub.3 NH.sub.2 ; (C.sub.2 H.sub.5 O).sub.2 C.sub.6 H.sub.5 Si(CH.sub.2).sub.3 NH.sub.2 ; (C.sub.2 H.sub.5 O).sub.3 SiCH.sub.2 O(CH.sub.2).sub.2 NH.sub.2 ; (C.sub.2 H.sub.5 O).sub.3 Si(CH.sub.2).sub.3 O(CH.sub.2).sub.2 NH.sub.2 ; and (C.sub.2 H.sub.5 O).sub.2 CH.sub.3 Si(CH.sub.2).sub.3 NH.sub.2. Mixtures of two or more primary amine-functional silanes (I) may be used if desired.
The primary amine-functional silane (I) is preferably used

REFERENCES:
patent: 3702778 (1972-11-01), Mueller et al.
patent: 4070421 (1978-01-01), Etter, Jr.
patent: 4431472 (1984-02-01), Hohl et al.
patent: 4758624 (1988-07-01), Sekiguchi et al.
patent: 4833187 (1989-05-01), Sittenthaler et al.

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