Patent US4670309A successfully refreshed from Google Patents.
US4670309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for providing anti-weathering resistance to the surface of organic materials
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1986-07-03
•
Granted: 1987-06-02
•
Expires: 2006-07-03
Abstract
Abstract The invention provides a method for protecting the surface of various kinds of shaped articles made of an organic polymeric material such as rubbers, leathers, woods, plastics and the like against weathering caused by exposure to ultraviolet light, ozone, moisture, etc. The method comprises providing the surface with a coating layer of a specific organopolysiloxane composed of difunctional, tetrafunctional and nonofunctional siloxane units in a limited molar proportion of 50-85%, 10-30% and 5-20%, respectively.
Inventors
- 👤 Fumio Okada
- 👤 Toshio Oba
- 👤 Morizo Nakazato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:56
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; B; B05; B05D; B05D2201/00; B05D2203/00; B05D2203/24; B05D7/00; B05D7/12; C08J2483/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
A method for protecting the surface of a shaped article of a polymeric material which comprises providing the surface with a coating layer of an organopolysiloxane composed of from 50 to 85% by moles of difunctional organosiloxane units represented by the general formula R 1 2 SiO, from 10 to 30% by moles of tetrafunctional siloxane units expressed by the formula SiO 2 and from 5 to 20% by moles of monofunctional organosiloxane units represented by the general formula R 2 3 SiO 0 .5, in which R 1 and R 2 are each independently a hydrogen atom or a monovalent hydrocarbon group, not all of the groups denoted by R 1 and R 2 being hydrogen atoms.
Claim 2
Independent Claim
118 words
A method for protecting the surface of a shaped article of a polymeric material which comprises providing the surface with a coating layer of an organopolysiloxane composed of from 50 to 85% by moles of difunctional organosiloxane units represented by the general formula R 1 2 SiO, from 10 to 30% by moles of tetrafunctional siloxane units expressed by the formula SiO 2 and from 5 to 20% by moles of monofunctional organosiloxane units represented by the general formula R 2 3 SiO 0 .5, in which R 1 and R 2 are each independently a hydrogen atom or a monovalent hydrocarbon group, not all of the groups denoted by R 1 and R 2 being hydrogen atoms.
Claim 3
Dependent Claim
26 words
The method as claimed in claim 1 wherein at least 60% by moles of the groups denoted by R 1 and R 2 are methyl groups.
References Cited (Backward Citations)
US2494920A
Cited
GB804162A
Cited
GB1377383A
Cited
US3983265A
Cited
US3919344A
Cited
US4388449A
Cited
DE2903376A1
Cited
US4395443A
Cited
US4370365A
Cited
US4490500A
Cited
US4418157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |