US4328326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melamine resins: process for their manufacture and the compression moulding compositions produced from the melamine resins
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1981-01-09
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Granted: 1982-05-04
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Expires: 2001-01-09
Abstract
Abstract Partially etherified melamine-formaldehyde resins having a melamine:formaldehyde molar ratio of 1:(1.25 to 1) can be prepared by a condensation reaction under neutral or weakly alkaline conditions if the condensation reaction is carried out in the presence of a glycol monoether of the general formula I R(OCH.sub.2 CH.sub.2).sub.n OH (I) wherein R denotes alkyl having 1 to 4 C atoms and n denotes a number from 1 to 5. The partially etherified melamine-formaldehyde resins are suitable for the production of compression moulding compositions having a high flow and minimal processing shrinkage and after-shrinkage.
Inventors
- 👤 Steffen Piesch
- 👤 Alfons Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:23
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/424; C08G12/425; C08G12/427; C08G12/26; C08G12/263; C08G12/266; C08L; C08L61/00; C08L61/20; C08L61/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
55 words
Partially etherified melamine-formaldehyde resin having a melamine:formaldehyde molar ratio of 1:(1.25 to 1) and containing relative to its solids content, a cross-linking amount but no more than 5% by weight of a glycol of the formula ##STR2## wherein R' is --CH 3 or --CH 2 OH and m denotes an integer from 1 to 4.
Claim 2
Dependent Claim
55 words
Partially etherified melamine-formaldehyde resin having a melamine:formaldehyde molar ratio of 1:(1.25 to 1) and containing relative to its solids content, a cross-linking amount but no more than 5% by weight of a glycol of the formula ##STR2## wherein R' is --CH 3 or --CH 2 OH and m denotes an integer from 1 to 4.
Claim 3
Dependent Claim
17 words
Partially etherfied melamine-formaldehyde resin according to claim 1 wherein the melamine:formaldehyde molar ratio is 1:(1.12 to 1).
References Cited (Backward Citations)
US3959201A
Cited
US4163835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |