US3935144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact adhesives
Assignee: BASF SE
•
Filing: 1974-06-03
•
Granted: 1976-01-27
•
Expires: 1994-06-03
Abstract
Abstract Polyurethane contact adhesives are produced without added solvent from polyols, amorphous thermoplastic tackifiers and 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate and which can be applied solvent-free to a great variety of substrates.
Inventors
- 👤 Kurt Hagenweiler
- 👤 Kurt Scholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:52
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/751; C08G18/752; C08G18/753; C08G18/755; C09; C09J; C09J175/00; C09J175/04; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A process for the manufacture of contact adhesives which comprises: mixing (a) 28 to 94 percent by weight of a polyol having a molecular weight from 300 to 8,000 and a hydroxyl number from 20 to 85 and (b) 5 to 60 percent by weight of an amorphous, thermoplastic, tackifier resin which has a softening point from 40° to 150°C. and a molecular weight from 200 to 7,500, without the addition of solvents; and reacting the mixture, without the use of solvent, with (c) 1 to 12 percent by weight of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate, the percentages by weight being based on the total weight of the components (a), (b) and (c).
Claim 2
Dependent Claim
109 words
A process for the manufacture of contact adhesives which comprises: mixing (a) 28 to 94 percent by weight of a polyol having a molecular weight from 300 to 8,000 and a hydroxyl number from 20 to 85 and (b) 5 to 60 percent by weight of an amorphous, thermoplastic, tackifier resin which has a softening point from 40° to 150°C. and a molecular weight from 200 to 7,500, without the addition of solvents; and reacting the mixture, without the use of solvent, with (c) 1 to 12 percent by weight of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate, the percentages by weight being based on the total weight of the components (a), (b) and (c).
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1 wherein the polyol is a polyether polyol having a molecular weight of from 900 to 6,000 and a hydroxyl number of from 25 to 70.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 wherein components (a) and (c) are employed in amounts sufficient to provide 0.8 to 1.2 equivalents of isocyanate groups per equivalent of hydroxy groups.
Claim 5
Dependent Claim
54 words
A process as claimed in claim 1 wherein the tackifier resin is selected from the group consisting of terpene resins, balsams, rosin, hydrogenated rosin, esters of rosin, esters of hydrogenated rosin, terpenephenol resins, alkylphenol resins, ketone resins, coumarone resins, indene resins, hydrocarbon resins, polyvinyl isobutyl ether, polyvinyl acetate, vinyl acetate/vinyl laurate copolymers and polyolefins.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 4 wherein a mixture of tackifier resins of different softening points is employed.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 4 wherein the tackifier resin has an acid number of not more than 70.
Claim 8
Dependent Claim
47 words
A process as claimed in claim 1 wherein component (a) is employed in an amount of from 40 to 80 percent, component (b) in an amount from 30 to 45 percent and component (c) in an amount from 2 to 8 percent, all percentages being by weight.
Claim 9
Dependent Claim
50 words
A process as claimed in claim 1 wherein the polyol and tackifier resin are mixed at a temperature above the softening point of the resin and the isocyanate is added at a temperature below 50°C., the mixture being shaped or applied to a substrate while still in a flowable condition.
Claim 10
Dependent Claim
11 words
The solvent-free contact adhesive obtained by the process of claim 1.
Claim 11
Dependent Claim
15 words
The solvent-free contact adhesive of claim 9 as a thin layer applied to a substrate.
References Cited (Backward Citations)
US3681277A
Cited
US3821165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |