US4820801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphenylene sulfide containing covalently bonded chlorine in a reduced amount
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1986-10-29
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Granted: 1989-04-11
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Expires: 2006-10-29
Abstract
Abstract A highly modified polyphenylene sulfide (hereinafter refer to as "PPS") which contains covalently bonded chlorine in a far less amount than conventional PPS's and is substantially free from ionically bonded chlorine and sodium, is produced by heat-treating a conventional PPS with at least one of organic, sulfur-containing compounds in a solvent capable of dissolving the PPS. Such a PPS is very useful as a coating or encapsulating material for electrical and electronic components, etc.
Inventors
- 👤 Hiroshi Inoue
- 👤 Toshikazu Kato
- 👤 Masaaki Otsuru
- 👤 Noriaki Emura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:22
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286; C08G75/0209; C08G75/0213; C08G75/025; C08G75/0254; C08G75/0277; C08G75/0281; C08K; C08K5/00; C08K5/36; C08K5/37; C08L; C08L81/00; C08L81/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
A polyphenylene sulfide consisting of at least 90 mole % of a first moiety represented by ##STR4## wherein n is an integer of at least 20, and the remainder being of a second moiety wherein said second moiety is a copolymerizable component selected from the group consisting of o- or m- phenylene group, biphenylene group, naphthalene group, tri- or tetra-valent phenylene group, which contains covalently bonded chlorine in an amount of 500 ppm or less and is substantially free from ionically bonded chlorine and sodium.
Claim 2
Dependent Claim
85 words
A polyphenylene sulfide consisting of at least 90 mole % of a first moiety represented by ##STR4## wherein n is an integer of at least 20, and the remainder being of a second moiety wherein said second moiety is a copolymerizable component selected from the group consisting of o- or m- phenylene group, biphenylene group, naphthalene group, tri- or tetra-valent phenylene group, which contains covalently bonded chlorine in an amount of 500 ppm or less and is substantially free from ionically bonded chlorine and sodium.
Claim 3
Dependent Claim
13 words
The polyphenylene sulfide according to claim 1 wherein n is 20 to 500.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |