Patent US3605500A successfully refreshed from Google Patents.
Patent US4122128A successfully refreshed from Google Patents.
US4122128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storable rapidly hardening epoxy resin adhesive
Assignee: BASF Corp
•
Filing: 1977-12-27
•
Granted: 1978-10-24
•
Expires: 1997-12-27
Abstract
Abstract A storable, rapidly hardening epoxy resin adhesive consisting of A. a polyglycidyl compound having a softening temperature between 40° and 90° C, b. a 2,5-di-(ω-aminoalkyl-1')-pyrazine of the formula ##STR1## wherein n is an integer from 3 to 6, and C. A COPOLYMER OF ETHYLENE, ACRYLIC ACID AND ACRYLATE HAVING A MELTING RANGE FROM 70° TO 110° C, said epoxy resin adhesive contains, per 1 equivalent of glycidyl groups, 0.5 to 1.5 equivalents of hydrogen atoms bonded to nitrogen of the 2,5-di(ω-aminoalkyl-1')-pyrazine and, per 100 parts by weight of the polyglycidyl compound, contains 3 to 20 parts by weight of the copolymer of ethylene, acrylic acid and acrylate.
Inventors
- 👤 Hans Lehmann
- 👤 Helmut Zondler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5046; C08G59/5053; C08G59/5073; C09; C09J; C09J163/00; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A storable, rapidly hardening epoxy resin adhesive which comprises a. a polyglycidyl compound containing an average more than one glycidyl group in the molecule and having a softening temperature between 40° and 90° C., b. a 2,5-di-(ω-aminoalkyl-1')-pyrazine of the general formula I ##STR5## wherein n is an integer from 3 to 6, and c. a copolymer of ethylene, acrylic acid and acrylate having a melting range from 70° to 110° C., said epoxy resin adhesive comprises, per 1 equivalent of glycidyl groups, 0.5 to 1.5 equivalents of hydrogen atoms bonded to nitrogen of the 2,5-di(ω-aminoalkyl-1')-pyrazine of the formula I, and, per 100 parts by weight of the polyglycidyl compound, 3 to 20 parts by weight of the copolymer of ethylene, acrylic acid and acrylate, and is in the form of a fine heterogeneous powder.
Claim 2
Dependent Claim
134 words
A storable, rapidly hardening epoxy resin adhesive which comprises a. a polyglycidyl compound containing an average more than one glycidyl group in the molecule and having a softening temperature between 40° and 90° C., b. a 2,5-di-(ω-aminoalkyl-1')-pyrazine of the general formula I ##STR5## wherein n is an integer from 3 to 6, and c. a copolymer of ethylene, acrylic acid and acrylate having a melting range from 70° to 110° C., said epoxy resin adhesive comprises, per 1 equivalent of glycidyl groups, 0.5 to 1.5 equivalents of hydrogen atoms bonded to nitrogen of the 2,5-di(ω-aminoalkyl-1')-pyrazine of the formula I, and, per 100 parts by weight of the polyglycidyl compound, 3 to 20 parts by weight of the copolymer of ethylene, acrylic acid and acrylate, and is in the form of a fine heterogeneous powder.
Claim 3
Dependent Claim
17 words
An adhesive according to claim 1 wherein the polyglycidyl compound (a) is a bisphenol A epoxy resin.
Claim 4
Dependent Claim
18 words
An adhesive according to claim 1 wherein the polyglycidyl compound (a) is a glycidylated phenol or cresol novolak.
Claim 5
Dependent Claim
15 words
An adhesive according to claim 1 which comprises 2,5-di-(5-aminopentyl-1')-pyrazine as compound of the formula I.
Claim 6
Dependent Claim
15 words
An adhesive according to claim 1 which comprises 2,5-di-(3-aminopropyl-1')-pyrazine as compound of the formula I.
Claim 7
Dependent Claim
34 words
An adhesive according to claim 1 wherein the copolymer (c) comprises 87 to 91% by weight of ethylene, 3 to 5% by weight of acrylic acid and 6 to 8% by weight of acrylate.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |