Film-forming silicone compositions having lubricating properties

• US 4,806,430 A
• Filed: 11/16/1987
• Issued: 02/21/1989
• Est. Priority Date: 12/03/1985
• Status: Expired due to Term

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Zdrahala, Richard J., Spielvogel, David E.
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US07/120,901
• Time in Patent Office: 463 Days
• Field of Search: 30/346.5, 206/571, 604/187, 534/862, 528/15, 528/31, 528/32, 524/588, 524/731, 427/387, 428/447, 428/450, 525/478
• US Class Current: 428/450
• CPC Class Codes: A61L 29/085 Macromolecular materials
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

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.

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 C_1-20, 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 C_1-20, 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.

2. The article of claim 1 wherein the substrate surface is metal or plastic.

3. The article of claim 2 wherein the metal surface has a fine cutting edge.

4. The article of claim 1 which is a hypodermic needle.

5. The article of claim 1 which is a razor blade.

6. The article of claim 1 wherein the first siloxane polymer comprises a mixture of two vinyldimethylsilyl terminated polydimethylsiloxanes having respective average molecular weights of about 16,000 and 38,000;

the second siloxane polymer has an average molecular weight of about 1900; and

the non-reactive lubricating siloxane comprises a trimethylsilyl termianted polydimethylsiloxane having an average molecular weight of about 16,000.

7. The article of claim 1 wherein the weight ratio of reactive component to non-reactive component is about 20:

80 to about 30;

70.

8. The article of claim 1 wherein the weight ratio of the first siloxane polymer to the second polymer in the reactive mixture is about 30:

70 to about 40;

60.

9. The article of claim 1 wherein said substrate is plastic and which is a catheter.