US3898197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocked polyisocyanate composition for the treatment of keratinous materials
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1973-02-07
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Granted: 1975-08-05
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Expires: 1993-02-07
Abstract
Abstract A bisulphite addition product of a polyisocyanate and/or polyisothiocyanate prepolymer, said addition product having on an average at least two isocyanate-bisulphite or isothiocyanatebisulphite adduct groups per molecule, having no free isocyanate or isothiocyanate groups, and being freely water-soluble; said prepolymer being derived from a polyisocyanate and/or polyisothiocyanate and a polyhydroxy compound.
Inventors
- 👤 Geoffrey Bruce Guise
- 👤 Mervyn Benjamin Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:36
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/10; Y; Y10; Y10S; Y10S8/00; Y10S8/11
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
A BISULPHITE ADDITION PRODUCT OF A POLYISOCYANATE AND/OR POLYISOTHIOCYANATE PREPOLYMER, SAID ADDITION PRODUCT HAVING ON AN AVERAGE AT LEAST TWO ISOCYANATE-BISULPHITE OR ISOTHIOCYANATE-BISULPHITE ADDUCT GROUPS PER MOLECULE, HAVING NO FREE ISOCYANATE OR ISOTHIOCYANATE GROUPS, AND BEING FREELY WATERSOLUBLE, SAID PREOOLYMER BEING AND/OR POLISOTHIOCYANATE AND A PRODUCT OF A POLYISOCYANATE AND/OR POLYISOTHIOCYANATE AND A POLYHYDROXY COMPOUND.
Claim 2
Dependent Claim
55 words
A BISULPHITE ADDITION PRODUCT OF A POLYISOCYANATE AND/OR POLYISOTHIOCYANATE PREPOLYMER, SAID ADDITION PRODUCT HAVING ON AN AVERAGE AT LEAST TWO ISOCYANATE-BISULPHITE OR ISOTHIOCYANATE-BISULPHITE ADDUCT GROUPS PER MOLECULE, HAVING NO FREE ISOCYANATE OR ISOTHIOCYANATE GROUPS, AND BEING FREELY WATERSOLUBLE, SAID PREOOLYMER BEING AND/OR POLISOTHIOCYANATE AND A PRODUCT OF A POLYISOCYANATE AND/OR POLYISOTHIOCYANATE AND A POLYHYDROXY COMPOUND.
Claim 3
Dependent Claim
30 words
An addition product as claimed in claim 1, wherein the polyisocyanate or polyisothiocyanate prepolymer has a molecular weight in the range 500 - 10,000 and a functionality greater than 2.
Claim 4
Dependent Claim
30 words
An addition product as claimed in claim 2, wherein the molecular weight of the prepolymer is in the range 1000 to 5000 and the functionality is from 2 to 4.
Claim 5
Dependent Claim
24 words
An addition product as claimed in claim 1, wherein all of the isocyanate groups in the polyisocyanate prepolymer are attached to aliphatic carbon atoms.
Claim 6
Dependent Claim
24 words
An addition product as claimed in claim 1, wherein the polyisocyanate has the structure OCN-(CH2)n-NCO wherein n is an integer from 2 to 16.
Claim 7
Dependent Claim
15 words
An addition product as claimed in claim 5, wherein n is from 4 to 6.
Claim 8
Dependent Claim
42 words
An addition product as claimed in claim 1, wherein the polyhydroxy compound has a backbone structure containing ether linkages only. 8. An addition product as claimed in claim 7, wherein some or all of said ether linkages are replaced by thioether linkages.
Claim 9
Dependent Claim
26 words
An addition product as claimed in claim 1, wherein the polyhydroxy compound is a polyether polyol having a molecular weight in the range 500 to 5000.
Claim 10
Dependent Claim
34 words
An addition product as claimed in claim 9, wherein the polyether polyol is a condensation product of glycerol or trimethylolpropane with propylene oxide and has a molecular weight in the range 1000 to 4000.
Claim 11
Dependent Claim
11 words
A bisulphite addition product of a polyisocyanate prepolymer of the formula
Claim 12
Dependent Claim
11 words
A bisulphite addition product of a polyisocyanate prepolymer of the formula
Claim 13
Dependent Claim
71 words
A process for the preparation of a bisulphite addition product of a polyisocyanate and/or polyisothiocyanate prepolymer, comprising reacting a water-insoluble polyisocyanate and/or polyisothiocyanate prepolymer with a bisulphite salt, or a salt capable of conversion to a bisulphite salt, in the presence of water and a water miscible organic solvent, the prepolymer being formed by the reaction of a polyisocyanate and/or a polyisothiocyanate with a compound containing at least two hydroxyl groups.
Claim 14
Dependent Claim
71 words
A process for the preparation of a bisulphite addition product of a polyisocyanate and/or polyisothiocyanate prepolymer, comprising reacting a water-insoluble polyisocyanate and/or polyisothiocyanate prepolymer with a bisulphite salt, or a salt capable of conversion to a bisulphite salt, in the presence of water and a water miscible organic solvent, the prepolymer being formed by the reaction of a polyisocyanate and/or a polyisothiocyanate with a compound containing at least two hydroxyl groups.
Claim 15
Dependent Claim
76 words
A process as claimed in claim 12, wherein the addition product is prepared by mixing i. the polyisocyanate and/or polyisothiocyanate prepolymer, ii. an aqueous solution containing bisulphite anions, and iii. a water miscible organic solvent, in such a manner that at least 80 percent by weight of the resultant mixture is composed of a homogeneous phase which contains at least 80 percent of the prepolymer and at least 80 percent by weight of the bisulphite anions.
References Cited (Backward Citations)
US2746988A
Cited
US3438940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |