US4938827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a silicone rubber-polyester composite products
Assignee: HP Inc
•
Filing: 1987-11-10
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Granted: 1990-07-03
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Expires: 2007-11-10
Abstract
Abstract Disclosed is a process for the preparation of a composite including a room temperature vulcanizing silicone rubber and a chemically resistant polyester film which may be polyethylene terephthalate. The composite has particular utility as a part of medical equipment, for example as a component in an ultrasonic transducer. The susceptibility of the composite bond so formed to chemical challenge in the user environment is reduced or eliminated.
Inventors
- 👤 Jerry G. Leach
- 👤 Edward C. Parnagian
- 👤 Gary A. Seavey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J5/00; C08J5/12; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
A process for bonding a silicone rubber to a chemically resistant polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; exposing the gas plasma treated polyester film to a siloxane coupling agent solution; rinsing the plasma-treated polyester film to remove all but a thin layer of the coupling agent; drying the polyester film coated with the coupling agent to remove all volatile materials; mixing an RTV silicone resin with a suitable catalyst therefor; applying of the RTV silicone resin-catalyst mixture to the dried and coupling agent-coated polyester film; curing the resultant film; and immersing the cured film in water to develop the cohesive bond between the polyester film and the RTV silicone rubber.
Claim 2
Dependent Claim
135 words
A process for bonding a silicone rubber to a chemically resistant polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; exposing the gas plasma treated polyester film to a siloxane coupling agent solution; rinsing the plasma-treated polyester film to remove all but a thin layer of the coupling agent; drying the polyester film coated with the coupling agent to remove all volatile materials; mixing an RTV silicone resin with a suitable catalyst therefor; applying of the RTV silicone resin-catalyst mixture to the dried and coupling agent-coated polyester film; curing the resultant film; and immersing the cured film in water to develop the cohesive bond between the polyester film and the RTV silicone rubber.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the polyester film is subjected to a chemical cleaning prior to the gas plasma exposure.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the polyester film is subjected to a bake cycle after the water immersion step.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the water immersion step is conducted with room temperature water.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the siloxane coupling agent utilized is selected from the group consisting of 3-(N-styrylmethyl-2-aminoethylamino) propyltrimethoxy silane HCL, N-2-aminoethyl-3-aminopropyltrymethoxy silane, trimethoxysilylpropyl-diethylene triamine 3-glycidoxypropyltrimethoxysilane, and 3-aminopropyltriethyloxysilane HCL.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein the RTV silicone resin is of the dimethyl and methylphenyl-substituted varieties and the catalyst utilized is dibutyl tin-dilaurate.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the water immersion step is conducted for at least about 4-12 hours.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the water immersion step is conducted for at least about 24 hours.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein the rinsing of the excess siloxane coupling agent is accomplished by ultrasonic cleaning in isopropanol.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein the polyester is a polyalkylene terephthalate.
Claim 12
Dependent Claim
11 words
The process of claim 10 wherein the polyester is polyethylene terephthalate.
Claim 13
Dependent Claim
11 words
The process of claim 10 wherein the polyester is polybutylene terephthalate.
Claim 14
Dependent Claim
100 words
A process for bonding an RTV silicone resin to a chemically resistent polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; mixing an RTV silicone resin with a suitable catalyst therefor; applying a siloxane coupling agent to the plasma-treated polyester film; applying the catalyzed RTV silicone resin to the plasma-treated polyester film; and allowing chemical bonds to form between the foregoing materials in the presence of sufficient water to stimulate bond formation stable to subsequent challenge by water.
Claim 15
Dependent Claim
100 words
A process for bonding an RTV silicone resin to a chemically resistent polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; mixing an RTV silicone resin with a suitable catalyst therefor; applying a siloxane coupling agent to the plasma-treated polyester film; applying the catalyzed RTV silicone resin to the plasma-treated polyester film; and allowing chemical bonds to form between the foregoing materials in the presence of sufficient water to stimulate bond formation stable to subsequent challenge by water.
Claim 16
Dependent Claim
126 words
A process for bonding an RTV silicone resin to a chemically resistent polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; and securely attaching a catalyzed silicone resin to the plasma-treated polyester film via a siloxane coupling agent by applying the catalyzed RTV silicone resin and the siloxane coupling agent to the plasma-treated polyester film and allowing bonds to form between the catalyzed RTV silicone resin and the siloxane coupling agent in the presence of sufficient water to substantially hydrate the interface between the catalyzed RTV silicone resin and the siloxane coupling agent and to stimulate a bond stable to subsequent challenge by water.
Claim 17
Dependent Claim
126 words
A process for bonding an RTV silicone resin to a chemically resistent polyester film in order to reduce or eliminate the susceptibility of the resulting bond to chemical challenge in the user environment, which comprises: exposing the polyester film to gas plasma treatment; and securely attaching a catalyzed silicone resin to the plasma-treated polyester film via a siloxane coupling agent by applying the catalyzed RTV silicone resin and the siloxane coupling agent to the plasma-treated polyester film and allowing bonds to form between the catalyzed RTV silicone resin and the siloxane coupling agent in the presence of sufficient water to substantially hydrate the interface between the catalyzed RTV silicone resin and the siloxane coupling agent and to stimulate a bond stable to subsequent challenge by water.
References Cited (Backward Citations)
US3462335A
Cited
US3607354A
Cited
US3972973A
Cited
US3959567A
Cited
GB2051844A
Cited
JPS58152026A
Cited
US4499148A
Cited
US4765860A
Cited
JPS60197740A
Cited
JPS6137826A
Cited
US4639285A
Cited
JPS62101421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |