Patent US4701513A successfully refreshed from Google Patents.
US4701513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel epoxy hardeners
Assignee: WR Grace and Co Conn
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Filing: 1986-12-15
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Granted: 1987-10-20
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Expires: 2006-12-15
Abstract
Abstract This invention relates to the use of compositions of the formula: ##STR1## wherein n is 2 to 4 and X is --O--, --S-- or ##STR2## wherein R 1 is an aliphatic or aromatic moiety as a curing agent for epoxy resins to form a thermoset material which has a reduced shrinkage.
Inventors
- 👤 Shiow C. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:05
CPC Classifications
C; C07; C07D; C07D498/00; C07D498/12; C07D498/20; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/44; C08G59/448; C08G59/50; C08G59/5046
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
A thermosettable composition comprising an epoxy resin and 0.1 to 99.9% by weight of the epoxy resin of an epoxy hardener of the formula: ##STR10## wherein n is 2 to 4 and X is --O--, --S-- or ##STR11## wherein R 1 is an aliphatic or aromatic moiety.
Claim 2
Dependent Claim
47 words
A thermosettable composition comprising an epoxy resin and 0.1 to 99.9% by weight of the epoxy resin of an epoxy hardener of the formula: ##STR10## wherein n is 2 to 4 and X is --O--, --S-- or ##STR11## wherein R 1 is an aliphatic or aromatic moiety.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein the epoxy hardener is: ##STR12##
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein the epoxy hardener is: ##STR13##
Claim 5
Dependent Claim
15 words
The composition of claim 1 containing in addition an anionic or cationic curing rate accelerator.
Claim 6
Dependent Claim
33 words
The composition of claim 4 wherein the curing rate accelerator is selected from the group consisting of tin octoate, t-butyl tin dilaurate, triphenylphosphine, pyridine, dimethylbenzylamine, BF 3 monoethylamine, diphenyliodonium tetrafluoroborate and diphenyliodonium hexafluorophosphate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |