US4021391A
Expired / Lapsed
US
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Pressure-sensitive adhesive composition
Assignee: Nitto Denko Corp
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Filing: 1975-12-19
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Granted: 1977-05-03
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Expires: 1995-12-19
Abstract
Abstract A pressure-sensitive adhesive composition comprising a liquid diene polymer containing in the molecule thereof an average of about 2.0 to about 2.5 functional groups capable of reacting with an isocyanate group, an isocyanate compound containing in the molecule thereof 2 or more isocyanate groups and a tackifier containing therein at least one polar group selected from the class consisting of --COOH, --OH, and --CH 2 OH, wherein the isocyanate compound is present in such amount that the isocyanate group(s) of the isocyanate compound is/are present in an amount of about 0.75 to about 1.2 equivalents per equivalent of the functional groups of the liquid diene based polymer, and the tackifier is present in an amount of about 10 to about 70, preferably 30 to 60, parts by weight per 100 parts by weight of the total weight of the liquid diene polymer and the isocyanate compound. This pressure-sensitive adhesive composition is coated on a support and heated to produce a pressure-sensitive layer, whereby a pressure-sensitive adhesive tape, for example, can be obtained.
Inventors
- 👤 Ichiro Ijichi
- 👤 Shigetoshi Kai
- 👤 Hikaru Teranishi
- 👤 Akira Morioka
- 👤 Kazuyoshi Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G18/692; C08G18/698; C09J175/14; C09J7/00; C09J7/30; C09J7/38; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
175 words
A pressure-sensitive adhesive composition for producing a pressure-sensitive adhesive, the pressure-sensitive adhesive composition consisting essentially of a homo- or co-polymer having a molecular weight of 1,000 to 50,000 of diene monomers or a copolymer of diene monomers and a vinyl monomer and containing in the molecule thereof an average of about 2.0 to about 2.5 functional groups capable of reacting with an isocyanate group, an isocyanate compound containing therein 2 or more isocyanate groups, and a tackifier miscible with the diene polymer and the isocyanate compound containing therein at least one polar group selected from the class consisting of --COOH, --OH, and --CH 2 OH, wherein the isocyanate compound is present in such amount that the isocyanate group of said isocyanate compound is about 0.75 to about 1.2 equivalents per equivalent of the functional group of the liquid diene polymer, and the tackifier is present in an amount of about 10 to about 70 parts by weight per 100 parts by weight of the total weight of the liquid diene polymer and the isocyanate compound.
Claim 2
Dependent Claim
175 words
A pressure-sensitive adhesive composition for producing a pressure-sensitive adhesive, the pressure-sensitive adhesive composition consisting essentially of a homo- or co-polymer having a molecular weight of 1,000 to 50,000 of diene monomers or a copolymer of diene monomers and a vinyl monomer and containing in the molecule thereof an average of about 2.0 to about 2.5 functional groups capable of reacting with an isocyanate group, an isocyanate compound containing therein 2 or more isocyanate groups, and a tackifier miscible with the diene polymer and the isocyanate compound containing therein at least one polar group selected from the class consisting of --COOH, --OH, and --CH 2 OH, wherein the isocyanate compound is present in such amount that the isocyanate group of said isocyanate compound is about 0.75 to about 1.2 equivalents per equivalent of the functional group of the liquid diene polymer, and the tackifier is present in an amount of about 10 to about 70 parts by weight per 100 parts by weight of the total weight of the liquid diene polymer and the isocyanate compound.
Claim 3
Dependent Claim
32 words
The pressure-sensitive adhesive composition according to claim 1, wherein the liquid diene polymer contains one or more functional groups selected from the class consisting of --OH, --CH 2 OH, --COOH, and --SH.
Claim 4
Dependent Claim
64 words
The pressure-sensitive adhesive composition according to claim 1, wherein the isocyanate compound is selected from the class consisting of diisocyanates, diisocyanate compounds or triisocyanate compounds produced from the diisocyanates and polyhydroxy compounds, polyisocyanates, or blocked isocyanates produced by reacting the isocyanate groups of the preceding isocyanate compounds with a compound of the formula ROH, where R is an aromatic, alicyclic or aliphatic monovalent group.
Claim 5
Dependent Claim
33 words
The pressure-sensitive adhesive composition according to claim 1, wherein the tackifier is selected from the class consisting of an alkyl phenol resin, a terpene phenol resin, a xylene-formaldehyde resin, rosin, and hydrogenated rosin.
Claim 6
Dependent Claim
36 words
The pressure-sensitive adhesive composition according in claim 1, wherein the adhesive composition further contains one or more of a plasticizer, a surface active agent, an antioxidant, and ultraviolet ray absorbent, a pigment or a non-pigmenting filler.
Claim 7
Dependent Claim
31 words
The pressure sensitive adhesive composition according to claim 1, wherein the liquid diene polymer is a homopolymer of a diene monomer selected from the group consisting of butadiene, isoprene and chlorprene.
Claim 8
Dependent Claim
72 words
The pressure sensitive adhesive composition according to claim 1, wherein the liquid diene polymer is a copolymer of one or more monomers selected from the group consisting of butadiene, isoprene and chloroprene and one or more vinyl monomers selected from the group consisting of styrene and acrylonitrile where the vinyl monomer in present in an amount of about 5 to about 40% by weight based on the total weight of diene polymer.
Claim 9
Dependent Claim
12 words
The pressure sensitive adhesive composition of claim 1 containing substantially no solvent.
Claim 10
Dependent Claim
11 words
The pressure sensitive adhesive composition of claim 1 containing no solvent.
Claim 11
Dependent Claim
39 words
The pressure sensitive adhesive composition of claim 1 wherein the tackifier has a molecular weight of about 200 to about 1500, a softening point of about 5 to about 150° C. and is solid or semi-solid at room temperature.
Claim 12
Dependent Claim
30 words
The pressure sensitive adhesive composition of claim 1 wherein the isocyanate compound is selected from the group consisting of p-phenylenediisocyanate, 2,4-tolylenediisocyanate, 1,5-naphthalenediisocyanate, 4,4'-diphenylmethanediisocyanate, 4,4'-diphenylether diisocyanate, hexamethylene diisocyanate and cyclohexane 1,4-diisocyanate.
References Cited (Backward Citations)
US3210302A
Cited
US3242230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |