US3923926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thixotropic polyurethane composition
Assignee: DKS Co Ltd
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Filing: 1974-01-29
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Granted: 1975-12-02
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Expires: 1994-01-29
Abstract
Abstract The thixotropic polyurethane composition comprises: a liquid of a polyurethane prepolymer having at least two terminal free isocyanate groups and a block polyether compound having at least two terminal secondary alcohol groups. The block polyether compound is a reaction product obtained by addition polymerization of ethylene oxide and propylene oxide in a block form to a starting material having two or three terminal active hydrogen groups in such a polymerization degree that said block polyether compound includes 30 to 409 moles of ethylene oxide and 3 to 172 moles of propylene oxide per molecule and the molar ratio between ethylene oxide and propylene oxide is within the range of 1 : 0.05 to 1 : 0.5. The thixotropic polyurethane composition may further include an inorganic material for enhancing the thixotropic property.
Inventors
- 👤 Hideo Harada
- 👤 Akinobu Ichihara
- 👤 Yasuro Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4845
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A THIXOTROPIC POLYURETHANE COMPOSITION COMPRISING: A. A LIQUID POLYURETHANE OREPOLYMER HAVING AT LEAST TWO TERMINAL FREE ISOCYANATE GROUPS AND AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF 50 TO 10,000 SAID POLYURETHANE PREPOLYMER BEING OBTAINED BY THE ADDITION POLYMERIZATION OF A POLYISOCYANATE WITH AN ACTIVE HYDROGEN COMPOUND, AND B. A BLOCK POLYETHER COMPOUND HAVING BOTH PRIMARY ALCOHOL GROUPS, AND SECONDARY ALCOHOL GROUPS AS TERMINAL GROUPS THEREOF, WITH THE SECONDARY ALCOHOL NUMBER CONTENT BEING 40% TO 85% WITH RESPECT TO THE TOTAL NUMBER OF TERMINAL ALCOHOL GROUPS, SAID BLOCK POLYETHER COMPOUND BEING A REACTION PRODUCT OBTAINED BY ADDITION POLYMERIZATION OF ETHYLENE OXIDE AND PROPYLENE OXIDE IN BLOCK FORM TO A STARTING MATERIAL HAVING TWO OR THREE TERMINAL ACTIVE HYDROGEN GROUPS IN SUCH A POLYMERIZATION DEGREE THAT SAID BLOCK POLYESTER COMPOUND INCLUDES 30 TO 409 MOLES OF ETHYLENE OXIDE AND 3 TO 172 MOLES OF PROPYLENE OXIDE PER MOLECULE AND THE MOLAR RATIO IS WITHIN THE RANGE OF 1 0.05 TO 1 : 0.5.
Claim 2
Dependent Claim
162 words
A THIXOTROPIC POLYURETHANE COMPOSITION COMPRISING: A. A LIQUID POLYURETHANE OREPOLYMER HAVING AT LEAST TWO TERMINAL FREE ISOCYANATE GROUPS AND AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF 50 TO 10,000 SAID POLYURETHANE PREPOLYMER BEING OBTAINED BY THE ADDITION POLYMERIZATION OF A POLYISOCYANATE WITH AN ACTIVE HYDROGEN COMPOUND, AND B. A BLOCK POLYETHER COMPOUND HAVING BOTH PRIMARY ALCOHOL GROUPS, AND SECONDARY ALCOHOL GROUPS AS TERMINAL GROUPS THEREOF, WITH THE SECONDARY ALCOHOL NUMBER CONTENT BEING 40% TO 85% WITH RESPECT TO THE TOTAL NUMBER OF TERMINAL ALCOHOL GROUPS, SAID BLOCK POLYETHER COMPOUND BEING A REACTION PRODUCT OBTAINED BY ADDITION POLYMERIZATION OF ETHYLENE OXIDE AND PROPYLENE OXIDE IN BLOCK FORM TO A STARTING MATERIAL HAVING TWO OR THREE TERMINAL ACTIVE HYDROGEN GROUPS IN SUCH A POLYMERIZATION DEGREE THAT SAID BLOCK POLYESTER COMPOUND INCLUDES 30 TO 409 MOLES OF ETHYLENE OXIDE AND 3 TO 172 MOLES OF PROPYLENE OXIDE PER MOLECULE AND THE MOLAR RATIO IS WITHIN THE RANGE OF 1 0.05 TO 1 : 0.5.
Claim 3
Dependent Claim
65 words
A thixotropic polyurethane composition as defined in claim 1, in which said polyisocyanate is a member selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 1-chlorophenylene-2,4-diisocyanate, 1.5-naphthalane diisocyanate, 3,3-bistoluene-4,4''-diisocyanate, methylene bisphenylene-4,4''-diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, polyaryl polyisocyanates, dimers and trimers of the foregoing and triisocyanates obtained by the reaction of 1 mole of a diisocyanate with 3 moles of trimethylolpropane.
Claim 4
Dependent Claim
55 words
A thixotropic polyurethane composition as defined in claim 1, in which said active hydrogen compound is a member selected from the group consisting of polyols, amines, polyamines and the mixtures thereof and has 2 to 6 active hydrogen groups per molecule and an average molecular weight between 30 and 300 per said active hydrogen group.
Claim 5
Dependent Claim
175 words
A thixotropic polyurethane composition as defined in claim 3, in which said active hydrogen compound is a member selected from the group consisting of di- and tri-ols of low molecular weights, selected from the group consisting of ethylene glycol, 1,4-butandiol, glycerine, and trimethylol propane; polyalkylene glycols, selected from the group consisting of polypropylene glycol and copolymers of ethylene oxide and propylene oxide; polymers obtained by the polymerization of a low molecular weight triol, selected from the group consisting of glycerine, trimethylol propane and 1,2,6-hexane triol, a low molecular weight tetraol, selected from the group consisting of pentaerythritol, or a low molecular weight hexaol, selected from the group consisting of sorbitol, with an alkylene oxide, selected from the group consisting of ethylene oxide and propylene oxide; amines selected from the group consisting of diethanol amine and triethanol amine; polyamines selected from the group consisting of ethylenediamine and 4,4''-methylene-bis-1-chloroamiline; and polymers obtained by the polymerization of one of said amines and polyamines with an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide.
Claim 6
Dependent Claim
26 words
A thixotropic polyurethane composition as defined in claim 1, in which said polyurethane prepolymer has an average molecular weight within the range of 500 to 10,000.
Claim 7
Dependent Claim
23 words
A thixotropic polyurethane composition as defined in claim 1, in which said liquid polyurethane prepolymer is a polyurethane prepolymer in a liquid phase.
Claim 8
Dependent Claim
35 words
A thixotropic polyurethane composition as defined in claim 1, in which said block polyether is included in said composition in an amount of 0.01 to 50 parts by weight per 100 parts of the polyurethane.
Claim 9
Dependent Claim
30 words
A thixotropic polyurethane composition as defined in claim 1, further including an inorganic material for enhancing the thixotropic property, selected from the group consisting of finely divided silica and bentonite.
Claim 10
Dependent Claim
40 words
A thixotropic polyurethane composition as defined in claim 8, in which the amount of said inorganic material is 0.5 to 10 parts by weight with respect to 100 parts by weight of said polyurethane prepolymer included in said polyurethane composition.
Claim 11
Dependent Claim
49 words
A method for the preparation of a thixotropic polyurethane composition as defined in claim 1 which comprises mixing said block polyether compound with said liquid polyurethane prepolymer in an inert gas atmosphere and at a temperature within the range of 60* to 120*C to form a homogeneous composition system.
Claim 12
Dependent Claim
85 words
A method for the preparation of the thixotropic polyUrethane composition as defined in claim 8 which comprises the steps of adding said thixotropy enhancing inorganic material to said liquid of polyurethane prepolymer in an inert gas atmosphere and at a temperature within the range of 100* to 150*C to form a dispersion system, and mixing said block polyether compound with said dispersion system in an inert gas atmosphere and at a temperature within the range of 60* to 120*C to form a homogeneous composition system.
References Cited (Backward Citations)
US3380967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |