Patent US2994087A successfully refreshed from Google Patents.
US4153775A
Expired / Lapsed
US
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Self-crosslinkable polyurethanes
Assignee: Bayer AG
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Filing: 1978-02-21
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Granted: 1979-05-08
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Expires: 1998-02-21
Abstract
Abstract Process for the production of solutions of segmented self-crosslinkable polyurethanes by incorporating in the polymer chain segments of the general formula M--CO--NH--D'--NH--CO--A, wherein D' is the divalent residue of an organic diisocyanate; M is a diol containing residue derived by reaction of the active N-hydrogen of an aminodiol or a hydrazinodiol which contains a primary or secondary amino group, with an isocyanate group; and A is an isocyanate masking group.
Inventors
- 👤 Hans D. Winkelmann
- 👤 Karlheinz Wolf
- 👤 Harald Oertel
- 👤 Norbert Weimann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
147 words
A process for the preparation of a solution of a polyurethane which is self-crosslinkable through masked isocyanate groups comprising reacting at least one long chain dihydroxy compound having a molecular weight of substantially 600 to 6000 with an excess of at least one organic diisocyanate in the presence of at least one isocyanate adduct diol having the formula: M--CO--NH--D'--NH--CO--A, wherein M is a diol containing residue derived by reaction of the active N-hydrogen of an aminodiol or a hydrazinodiol which contains a primary or secondary amino group, with an isocyanate group; D' is the divalent residue of an organic diisocyanate; and A is an isocyanate masking group, to form a substantially linear modified isocyanate prepolymer containing from 0.1 to 10% by weight, based on the solids content, of isocyanate adduct diol in combined form; and then reacting the product with a chain lengthening agent in a solvent.
Claim 2
Dependent Claim
147 words
A process for the preparation of a solution of a polyurethane which is self-crosslinkable through masked isocyanate groups comprising reacting at least one long chain dihydroxy compound having a molecular weight of substantially 600 to 6000 with an excess of at least one organic diisocyanate in the presence of at least one isocyanate adduct diol having the formula: M--CO--NH--D'--NH--CO--A, wherein M is a diol containing residue derived by reaction of the active N-hydrogen of an aminodiol or a hydrazinodiol which contains a primary or secondary amino group, with an isocyanate group; D' is the divalent residue of an organic diisocyanate; and A is an isocyanate masking group, to form a substantially linear modified isocyanate prepolymer containing from 0.1 to 10% by weight, based on the solids content, of isocyanate adduct diol in combined form; and then reacting the product with a chain lengthening agent in a solvent.
Claim 3
Dependent Claim
19 words
The process according to claim 1, wherein said chain lengthening is carried out with a diol or with water.
Claim 4
Dependent Claim
30 words
The process according to claim 1, wherein said chain lengthening is carried out with a compound having a molecular weight of from 32 to 400 which has N-H-active end groups.
Claim 5
Dependent Claim
21 words
The process according to claim 3, wherein said chain lengthening is carried out with a diamine, aminoalcohol, dihydrazide compound or hydrazine.
Claim 6
Dependent Claim
73 words
The process according to claim 1, wherein said isocyanate adduct diol used for incorporation into the molecular structure is represented by the following general formula: M--CO--NH--D'--NH--CO--A in which M is a group represented by the following formula: ##STR21## wherein R 1 and R 2 , are identical or different and represent a straight chain or branched alkylene group having up to 12 C-atoms or a cycloalkylene group, and x represents 0 or 1.
Claim 7
Dependent Claim
48 words
The process according to claim 5, wherein R 1 represents the group ##STR22## wherein R 3 is hydrogen or C 1 -C 4 -alkyl, R 2 represents a straight chain or branched chain alkylene group having up to 12 C-atoms or a cycloalkylene group, and x is 0.
Claim 8
Dependent Claim
12 words
The process as claimed in claim 6, wherein R 3 is methyl.
Claim 9
Dependent Claim
77 words
The process according to claim 1, wherein said isocyanate adduct diol used for incorporation into the molecular structure is represented by the general formula: M--CO--NH--D'--NH--CO--A in which M is a group represented by the following general formula: ##STR23## wherein R 1 and R 2 are identical or different and represent a straight chain or branched alkylene group, having up to 12 C-atoms or a cycloalkylene group, and R 4 represents hydrogen and/or C 1 -C 4 -alkyl.
Claim 10
Dependent Claim
11 words
The process according to claim 8, wherein R 4 is methyl.
Claim 11
Dependent Claim
23 words
The process according to claim 1, wherein D' represents a divalent group which is derived from diphenylmethane-4,4'-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, phenylene-1,3-diisocyanate, phenylene-1,4-diisocyanate or diphenylether-4,4'-diisocyanate.
Claim 12
Dependent Claim
31 words
The process according to claim 1, wherein said isocyanate masking group A is derived from a phenol, acetoacetic ester, malonic ester, acetylacetone, phthalimide, benzene sulphonamide, 2-mercaptobenzothiazole, hydrocyanic acid or a lactam.
Claim 13
Dependent Claim
24 words
The process according to claim 1, wherein said isocyanate masking group A is derived from pyrrolidone, α-piperidone, ε-caprolactam, methylcaprolactam, γ-ethyl caprolactam or γ-tert.-butyl caprolactam.
Claim 14
Dependent Claim
11 words
A polyurethane solution prepared by a process according to claim 1.
Claim 15
Dependent Claim
34 words
A process for the preparation of a polyurethane shaped product, wherein a polyurethane solution according to claim 13 is processed into a shaped product and crosslinking is effected by heat during or after shaping.
Claim 16
Dependent Claim
16 words
A process according to claim 14, wherein said shaped product is a foil, filament or coating.
Claim 17
Dependent Claim
12 words
A polyurethane shaped product prepared by a process according to claim 14.
References Cited (Backward Citations)
US3415768A
Cited
US3796678A
Cited
US3726838A
Cited
US3795642A
Cited
US3935146A
Cited
US4070345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |