Film-forming silicone compositions having lubricating properties
First Claim
Patent Images
1. An article comprising a substrate having a composition coated onto a surface thereof, said composition adhering to said surface and lubricating said surface, said composition comprising:
- (a) a reactive component for providing adhesion, said reactive component comprising(1) a first siloxane polymer having the formula selected from the group consisting of ##STR16## wherein R is selected from the group consisting of alkyl C1-20, haloalkyl, aryl, haloaryl, cycloalkyl, silacyclopentyl, aralkyl and mixtures thereof;
x is about 60 to about 1000; and
y is about 3 to about 25;
(2) a second siloxane crosslinking polymer of the formula ##STR17## wherein x is about 8 to about 12; and
(3) a third siloxane chain-extending polymer having the formula ##STR18## wherein x is about 140 to about 160;
(b) a non-reactive lubricating siloxane polymer component of the formula ##STR19## wherein R is selected from the group consisting of alkyl C1-20, haloalkyl, aryl, haloaryl, cycloalkyl, silacyclopentyl, aralykl, and mixtures thereof;
x is about 20 to about 1350; and
(c) the mole ratio of vinyl groups to hydrogen groups is within the range of between about 0.010;
1 and 0.20;
1.
0 Assignments
0 Petitions
Accused Products
Abstract
A film-forming siloxane composition having excellent adherent and lubricating properties comprising a reactive component having a combination of three siloxane polymers chemically crosslinked, and a non-reactive component dispersed therein. Substrates are dipped or otherwise coated with the compositions, at which time they are cured quickly under heat to a durable, adherent lubricating surface which is dry to the touch. Of particular advantage is the use of these films on hypodermic needles, razor blades, catheters and the like.
68 Citations
9 Claims
-
1. An article comprising a substrate having a composition coated onto a surface thereof, said composition adhering to said surface and lubricating said surface, said composition comprising:
-
(a) a reactive component for providing adhesion, said reactive component comprising (1) a first siloxane polymer having the formula selected from the group consisting of ##STR16## wherein R is selected from the group consisting of alkyl C1-20, haloalkyl, aryl, haloaryl, cycloalkyl, silacyclopentyl, aralkyl and mixtures thereof;
x is about 60 to about 1000; and
y is about 3 to about 25;(2) a second siloxane crosslinking polymer of the formula ##STR17## wherein x is about 8 to about 12; and
(3) a third siloxane chain-extending polymer having the formula ##STR18## wherein x is about 140 to about 160;
(b) a non-reactive lubricating siloxane polymer component of the formula ##STR19## wherein R is selected from the group consisting of alkyl C1-20, haloalkyl, aryl, haloaryl, cycloalkyl, silacyclopentyl, aralykl, and mixtures thereof;
x is about 20 to about 1350; and(c) the mole ratio of vinyl groups to hydrogen groups is within the range of between about 0.010;
1 and 0.20;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification