Claims
- 1. A pressure-sensitive adhesive composition containing as a polymer component an addition-polymerization polymer of an acrylate or methacrylate polymer having sticking properties at room temperature and one or more ethylenically unsaturated monomers capable of forming a homo- or co-polymer having a glass transition point of at least 273.degree. K., said addition-polymerization polymer being produced by polymerizing one or more ethylenically unsaturated monomers in the presence of the acrylate or methacrylate polymer having sticking properties at room temperature, wherein the ethylenically unsaturated monomer is selected from at least one member of the group consisting of (a) styrene and a styrene derivative, (b) vinyl acetate, (c) acrylonitrile, (d) methacrylonitrile, (e) an acrylate derivative, and (f) a methacrylate derivative, each being capable of forming a homopolymer having a glass transition point of at least 273.degree. K.
- 2. A pressure-sensitive adhesive composition as in claim 1 wherein the ethylenically unsaturated monomer comprises an unsaturated monomer selected from at least one member of the group consisting of styrene, vinyl acetate, acrylonitrile, methacrylonitrile, an acrylate derivative, a methacrylate derivative, and a styrene derivative, each being capable of forming a homopolymer having a glass transition point of at least 273.degree. K., and an unsaturated monomer which is capable of copolymerizing with said ethylenically unsaturated monomer to form a copolymer having a glass transition point of at least 273.degree. K., said latter unsaturated monomer constituting not more than 50% by weight of the total unsaturated monomer weight.
- 3. A pressure-sensitive adhesive composition as in claim 2 wherein the latter unsaturated monomer constitutes not more than 30% by weight of the total unsaturated monomer weight.
- 4. A pressure-sensitive adhesive composition as in claim 2, or 3 wherein the unsaturated monomer selected from the group consisting of an acrylate derivative, a methacrylate derivative, and a styrene derivative is able to form a homopolymer having a glass transition point of at least 300.degree. K.
- 5. A pressure-sensitive adhesive composition as in claim 4 wherein the methacrylate is methyl methacrylate.
- 6. A pressure-sensitive adhesive composition as in claim 1, 2 or 3 wherein the acrylate or methacrylate polymer has an average molecular weight of at least about 100,000.
- 7. A pressure-sensitive adhesive composition as in claim 1, or 2 wherein the ethylenically unsaturated monomer is used in an amount of from 5 to 200 parts by weight per 100 parts by weight of the acryl-based polymer.
- 8. A pressure-sensitive adhesive composition as in claim 1, 2, or 3 wherein the ethylenically unsaturated monomer is added in an amount of from 10 to 150 parts by weight per 100 parts by weight of the acrylate or methacrylate polymer.
- 9. A pressure-sensitive adhesive composition as in claim 1, 2, or 3 wherein the addition-polymerization is carried out in the presence of an organic solvent.
- 10. A pressure-sensitive adhesive composition as in claim 9 wherein the amount of the organic solvent is from 5 to 900 parts by weight per 100 parts by weight of the acrylate or methacrylate polymer.
- 11. A pressure-sensitive adhesive composition as claim 9 wherein the organic solvent is toluene or a mixed solvent containing at least 50% by weight toluene.
- 12. A pressure-sensitive adhesive composition as in claim 1, 2, or 3 wherein the addition-polymerization is carried out in the absence of an organic solvent.
- 13. A pressure-sensitive adhesive composition as in claim 12 wherein a chain transfer agent is added in an amount of from 0.01 to 1.0 parts by weight per 100 parts by weight of the ethylenically unsaturated monomer.
- 14. A pressure-sensitive adhesive composition as in claim 1, 2 or 3 wherein an organic peroxide is used as as polymerization catalyst.
- 15. A pressure-sensitive adhesive composition as in claim 1, 2, or 3 wherein a crosslinking agent is added to the polymer component after the addition-polymerization in an amount of 0.001 to 1.5 parts by weight per 100 parts by weight of the acrylate or methacrylate polymer.
- 16. A pressure-sensitive adhesive composition as in claim 10 wherein the amount of the organic solvent is from 25 to 400 parts by weight per 100 parts by weight of the acrylate or methacrylate polymer.
- 17. A pressure-sensitive adhesive composition as in claim 13 wherein the chain transfer agent is added in an amount of from 0.03 to 0.6 parts by weight per 100 parts by weight of the ethylenically unsaturated monomer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-102532 |
Aug 1979 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 177,046, filed 8/11/80, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
53-46337 |
Apr 1978 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Laus F. Martin, Pressure Sensitive Adhesives, Formulations and Technology, pp. 2-68, 1974. |
Continuations (1)
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Number |
Date |
Country |
Parent |
177046 |
Aug 1980 |
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