US4806430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-forming silicone compositions having lubricating properties
Assignee: Becton Dickinson and Co
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Filing: 1987-11-16
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Granted: 1989-02-21
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Expires: 2007-11-16
Abstract
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.
Inventors
- 👤 David E. Spielvogel
- 👤 Richard J. Zdrahala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
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.
Claim 2
Dependent Claim
187 words
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.
Claim 3
Dependent Claim
13 words
The article of claim 1 wherein the substrate surface is metal or plastic.
Claim 4
Dependent Claim
14 words
The article of claim 2 wherein the metal surface has a fine cutting edge.
Claim 5
Dependent Claim
10 words
The article of claim 1 which is a hypodermic needle.
Claim 6
Dependent Claim
10 words
The article of claim 1 which is a razor blade.
Claim 7
Dependent Claim
58 words
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.
Claim 8
Dependent Claim
21 words
The article of claim 1 wherein the weight ratio of reactive component to non-reactive component is about 20:80 to about 30:70.
Claim 9
Dependent Claim
28 words
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.
Claim 10
Dependent Claim
15 words
The article of claim 1 wherein said substrate is plastic and which is a catheter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |