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US3787342A
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Hot-melt adhesive composition containing glycerol ester of fumaric-modified rosin
Assignee: United States Department of Agriculture
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Filing: 1970-02-27
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Granted: 1974-01-22
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Expires: 1990-02-27
Abstract
Abstract Hot-melt adhesive composition consisting essentially of a substantially linear polyamide resin, having an average molecular weight between 3,000 and 10,000 and a Ball and Ring softening point between 45* and 190* C, and between 5 and 30 parts by weight of glycerol ester of fumaric-modified rosin for each 100 parts by weight of the linear polyamide resin; with a preferred composition containing between 10 and 20 phr of the glycerol ester of fumaric-modified rosin and up to 10 phr of a petroleumderived wax selected from the group of paraffin and microcrystalline waxes.
Inventors
- 👤 D Berry
- 👤 W Schuller
- 👤 R Lawrence
- 👤 A Bunk
- 👤 N Halbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:27
CPC Classifications
C; C09; C09J; C09J177/00; C09J177/06; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
The composition of claim 1 which also includes up to 10 parts by weight of a petroleum-derived wax having a melting point no higher than the Ball and Ring softening point of the polyamide resin and selected from the group consisting of paraffin wax and microcrystalline wax.
Claim 2
Dependent Claim
145 words
A hot-melt adhesive composition comprising: a. 100 parts by weight of a polyamide resin of a generally linear nature, a relatively neutral character, having an average molecular weight within the range of 3,000 to 10,000, a Ball and Ring softening point between 45* and 190* C. and being the thermoplastic reaction product of a mixture of dimer acids consisting essentially of a mixture of about 36-carbon atom dibasic acids with a low-molecular weight aliphatic or aromatic diamine; b. 10 to 20 parts by weight of glycerol esters of fumaric-modified rosin, which glycerol esters are prepared by reacting a fumaric-modified rosin selected from the group consisting of fumaric-modified gum rosin, fumaric-modified wood rosin, and fumaric-modified tall oil rosin with sufficient glycerol to esterify the carboxylic acid groups present in the fumaric-modified rosin, thereby to produce an essentially completely esterified fumaric-modified rosin substantially devoid of anhydride groups.
Claim 3
Dependent Claim
12 words
The composition of claim 3 wherein the fumaric-modified rosin is gum rosin.
Claim 4
Dependent Claim
12 words
The composition of claim 3 wherein the fumaric-modified rosin is wood rosin.
Claim 5
Dependent Claim
13 words
The composition of claim 3 wherein the fumaric-modified rosin is tall oil rosin.
References Cited (Backward Citations)
US3253059A
Cited
US3377305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |