US4925698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface modification of polymeric materials
Assignee: Tekmat Corp
•
Filing: 1989-03-08
•
Granted: 1990-05-15
•
Expires: 2009-03-08
Abstract
Abstract A method of increasing the adsorption resistance of a polymer having surface carboxyl or hydroxyl groups by directly contacting the surface of the polymer with an acylating agent under conditions sufficient to chemically react the carboxyl or hydroxyl groups with the acylating agent.
Inventors
- 👤 Mitchell Klausner
- 👤 Michael P. Manning
- 👤 Raymond F. Baddour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:56
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08J; C08J7/00; C08J7/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
54 words
A method of increasing the adsorption resistance of a polymer having surface carboxyl or hydroxyl groups comprising directly contacting the surface of said polymer with an acylating agent in the vapor phase under conditions sufficient to chemically react said carboxyl or said hydroxyl groups with said acylating agent without pretreating said surface with base.
Claim 2
Independent Claim
54 words
A method of increasing the adsorption resistance of a polymer having surface carboxyl or hydroxyl groups comprising directly contacting the surface of said polymer with an acylating agent in the vapor phase under conditions sufficient to chemically react said carboxyl or said hydroxyl groups with said acylating agent without pretreating said surface with base.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said acylating agent comprises an acid halide.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said acid halide has between 1 and 4 carbon atoms, inclusive.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein said acid halide is acryloyl chloride.
Claim 6
Dependent Claim
12 words
The method of claim 2 wherein said acid halide is acetyl chloride.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said acylating agent comprises an acid anhydride.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said acylating agent comprises an amide.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein said carboxyl or hydroxyl groups are present as side groups in said polymer.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein said carboxyl or hydroxyl groups are present as end groups in said polymer.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein said polymer is crosslinked and said carboxyl or hydroxyl groups are from the reagent used to crosslink said polymer.
Claim 12
Independent Claim
56 words
A method of increasing the soil resistance of a hydrophilic contact lens having surface carboxyl or hydroxyl groups comprising directly contacting the surface of said lens with an acylating agent in the vapor phase under conditions sufficient to chemically react said carboxyl or said hydroxyl groups with said acylating agent without pretreating said surface with base.
Claim 13
Independent Claim
56 words
A method of increasing the soil resistance of a hydrophilic contact lens having surface carboxyl or hydroxyl groups comprising directly contacting the surface of said lens with an acylating agent in the vapor phase under conditions sufficient to chemically react said carboxyl or said hydroxyl groups with said acylating agent without pretreating said surface with base.
Claim 14
Dependent Claim
13 words
The method of claim 11 wherein said acylating agent comprises an acid halide.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein said acid halide has between 1 and 4 carbon atoms, inclusive.
Claim 16
Dependent Claim
12 words
The method of claim 12 wherein said acid halide is acryloyl chloride.
Claim 17
Dependent Claim
12 words
The method of claim 12 wherein said acid halide is acetyl chloride.
Claim 18
Dependent Claim
13 words
The method of claim 11 wherein said acylating agent comprising an acid anhydride.
Claim 19
Dependent Claim
12 words
The method of claim 11 wherein said acylating agent comprises an amide.
References Cited (Backward Citations)
US2976576A
Cited
US3108902A
Cited
US3220960A
Cited
US3503942A
Cited
US3503393A
Cited
US3560424A
Cited
US3657003A
Cited
US3963662A
Cited
US4131696A
Cited
US4168112A
Cited
US4338419A
Cited
US4309285A
Cited
US4409285A
Cited
US4388345A
Cited
US4544572A
Cited
US4544572B1
Cited
US4569858A
Cited
US4687816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |