US4282346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of copolyamide from dicarboxylic acid mixture, piperazine and polyoxyalkylene diamine
Assignee: Union Camp Corp
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Filing: 1979-10-26
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Granted: 1981-08-04
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Expires: 1999-10-26
Abstract
Abstract Copolyamides derived from a mixture of short-chain and long-chain saturated aliphatic dicarboxylic acids, piperazine and a polyoxyalkylene diamine are excellent hot melt adhesives useful with a variety of substrates. These thermoplastic copolyamide resins are particularly useful adhesives for vinyl materials and are resistant to creep.
Inventors
- 👤 Hubert J. Sharkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:14
CPC Classifications
C; C09; C09J; C09J177/00; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/34; C08G69/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
In a process for the preparation of thermoplastic copolyamide adhesive resins by the reaction of essentially stoichiometric amounts of reactants consisting essentially of (a) a mixture of adipic acid and a long-chain aliphatic saturated dicarboxylic acid having 8 to 14 carbon atoms, (b) piperazine and (c) a polyoxyalkylene diamine of the general formula ##STR2## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800, the improvement which comprises heating the adipic acid, long-chain aliphatic saturated dicarboxylic acid and polyoxyalkylene diamine at 160° C. to 220° C. with agitation under an inert atmosphere and adding piperazine as an anhydrous melt or aqueous solution at a rate to avoid polymeric salt formation.
Claim 2
Dependent Claim
130 words
In a process for the preparation of thermoplastic copolyamide adhesive resins by the reaction of essentially stoichiometric amounts of reactants consisting essentially of (a) a mixture of adipic acid and a long-chain aliphatic saturated dicarboxylic acid having 8 to 14 carbon atoms, (b) piperazine and (c) a polyoxyalkylene diamine of the general formula ##STR2## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800, the improvement which comprises heating the adipic acid, long-chain aliphatic saturated dicarboxylic acid and polyoxyalkylene diamine at 160° C. to 220° C. with agitation under an inert atmosphere and adding piperazine as an anhydrous melt or aqueous solution at a rate to avoid polymeric salt formation.
Claim 3
Dependent Claim
64 words
The process of claim 1 wherein the long-chain aliphatic saturated dicarboxylic acid is azelaic acid or sebacic acid, the polyoxyalkylene diamine is a polyoxypropylene diamine having an average molecular weight from 300 to 600, the equivalents ratio of adipic acid to azelaic or sebacic acid ranges from 0.5:0.5 to 0.9:0.1 and the equivalents ratio of piperazine to polyoxypropylene diamine ranges from 0.7:0.3 to 0.95:0.5.
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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |