US4065440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malonate ester chain coupling of polyesters
Assignee: BP Corp North America Inc
•
Filing: 1976-08-09
•
Granted: 1977-12-27
•
Expires: 1996-08-09
Abstract
Abstract Increasing the molecular weight of polyesters by reaction with polyfunctional acyl compounds having at least two alkylidene malonate groups.
Inventors
- 👤 Carl Serres, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:09
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
The method of increasing the molecular weight of polyesters which comprises forming a composition comprising a polyester having an I.V. of at least 0.2 dl/g and 0.1 to 10 parts by weight of a compound having two or three alkylidene malonate groups per 100 parts by weight of said polyester and reacting said polyester and compound under melt or solid state polymerization conditions.
Claim 2
Independent Claim
63 words
The method of increasing the molecular weight of polyesters which comprises forming a composition comprising a polyester having an I.V. of at least 0.2 dl/g and 0.1 to 10 parts by weight of a compound having two or three alkylidene malonate groups per 100 parts by weight of said polyester and reacting said polyester and compound under melt or solid state polymerization conditions.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said polyester has at least about 75 mol percent of the acid moieties provided by terephthalic acid moieties and/or naphthalene 2,6-dicarboxylic acid moieties.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said compound contains at least 2 isopropylidene groups.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said isopropylidene compound is diisopropylidene methylene dimalonate.
Claim 6
Dependent Claim
13 words
The process of claim 3, wherein said isopropylidene compound is diisopropylidene benzylidene dimalonate.
Claim 7
Dependent Claim
12 words
The process of claim 3 wherein said isopropylidene compound is diisopropylidene-1,1,2,2-cyclopropane tetracarboxylate.
Claim 8
Dependent Claim
13 words
The process of claim 3 wherein said isopropylidene compound is diisopropylidene methylene di-(methylmalonate).
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein said compound contains at least two cyclohexylidene groups.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein said cyclohexylidene compound is dicyclohexylidene methylene dimalonate.
Claim 11
Dependent Claim
33 words
The process of claim 1 wherein said compound having at least two alkylidene malonate groups is present in a concentration of 0.5 to 5.0 parts by weight per 100 parts by weight polyester.
References Cited (Backward Citations)
US3954716A
Cited
US3962190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |