US4810523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive adhesives
Assignee: Neutron Products Inc
•
Filing: 1986-12-15
•
Granted: 1989-03-07
•
Expires: 2006-12-15
Abstract
Abstract Acrylate-based pressure-sensitive adhesives are produced by a process in which a liquid, polymerizable monomer composition containing at least one acrylate monomer is placed in a closed reaction vessel, deaerated and the monomer(s) are polymerized by exposure to ionizing radiation such as gamma irradiation. The process allows for the direct production of low-solvent or solventless acrylate-based adhesives suitable for application by hot-melt techniques.
Inventors
- 👤 Jeffrey D. Williams
- 👤 Marvin L. Young
- 👤 Syed S. Ahmad
- 👤 Jackson A. Ransohoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:16
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/46; C08F2/54; Y; Y10; Y10S; Y10S522/00; Y10S522/903; Y10S522/911; Y10S522/912
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
200 words
A process for preparing a substrate for bonding which comprises applying to the substrate by hot-melt application a pressure-sensitive adhesive which is produced by the process which comprises: (a) introducing, to a sealable reaction vessel, a liquid, polymerizable monomer composition, comprising: (i) from 65 to 100 parts of at least one acrylate monomer of the formula: ##STR3## wherein R 1 is hydrogen or methyl and R 2 is a straight or branched chain alkyl having from 2 to 8 carbon atoms, (ii) from 0 to 35 parts of at least one ethylenically unsaturated comonomer per 100 parts of liquid polymerizable monomer composition; and (b) dearating the liquid polymerizable monomer composition before or after introducing it into the vessel; and (c) polymerizing the monomers in the containers by exposing them to ionizing radiation, at a dose rate greater than 1 kilorad per hour and less than 1 kilorad per second, said polymerization being carried out in the presence of less than 30% by weight of an organic solvent, based on the combined weight of the liquid, polymerizable monomer composition and solvent, so as to produce a viscoelastic polymer mass having a low level of residual monomer and oapable of hot-melt application.
Claim 2
Dependent Claim
200 words
A process for preparing a substrate for bonding which comprises applying to the substrate by hot-melt application a pressure-sensitive adhesive which is produced by the process which comprises: (a) introducing, to a sealable reaction vessel, a liquid, polymerizable monomer composition, comprising: (i) from 65 to 100 parts of at least one acrylate monomer of the formula: ##STR3## wherein R 1 is hydrogen or methyl and R 2 is a straight or branched chain alkyl having from 2 to 8 carbon atoms, (ii) from 0 to 35 parts of at least one ethylenically unsaturated comonomer per 100 parts of liquid polymerizable monomer composition; and (b) dearating the liquid polymerizable monomer composition before or after introducing it into the vessel; and (c) polymerizing the monomers in the containers by exposing them to ionizing radiation, at a dose rate greater than 1 kilorad per hour and less than 1 kilorad per second, said polymerization being carried out in the presence of less than 30% by weight of an organic solvent, based on the combined weight of the liquid, polymerizable monomer composition and solvent, so as to produce a viscoelastic polymer mass having a low level of residual monomer and oapable of hot-melt application.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the polymerization is carried out in the presence of less than 5% by weight of an organic solvent.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the polymerization is carried out in the absence of solvent.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 1, wherein the liquid, polymerizable monomer composition also contains from 0 to 4 parts of a chain transfer agent, per 100 parts of liquid, polymerizable monomer composition.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 4, wherein the chain transfer agent is selected from isopropyl alcohol and triethanolamine.
Claim 7
Dependent Claim
33 words
A process as claimed in claim 1, wherein the liquid, polymerizable monomer composition is exposed to ionizing radiation at a predetermined dose rate in the range of 5 to 250 kilorads per hour.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1, wherein the ionizing radiation is gamma radiation.
Claim 9
Dependent Claim
36 words
A process as claimed in claim 1, wherein the liquid, polymerizable monomer composition is placed in a cylindrical container having a diameter of from about 1 inch to about 26 inches and exposed to gamma radiation.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 1, wherein the acrylate monomer is selected from the group consisting of 2-ethylhexyl acrylate, n-butyl acrylate, isobutyl acrylate and ethyl acrylate.
Claim 11
Dependent Claim
29 words
A process as claimed in claim 1, wherein the ethylenically unsaturated comonomer is selected from the group consisting of acrylic acid, methacrylic acid, acrylonitrile, vinyl acetate and vinyl pyrrolidone.
Claim 12
Dependent Claim
14 words
A process as claimed in claim 1, wherein the acrylate monomer is 2-ethylhexyl acrylate.
Claim 13
Dependent Claim
26 words
A process as claimed in claim 1, wherein polymerization is carried out to obtain a polymer having an intrinsic viscosity of at least about 2.5 dl/g.
Claim 14
Dependent Claim
18 words
A process as claimed in claim 12, wherein the presure-sensitive adhesive is produced by homopolymerization of 2-ethylhexyl acrylate.
Claim 15
Dependent Claim
53 words
A process as claimed in claim 1, wherein the liquid, polymerizable monomer composition is exposed to ionizing radiation first at a dose rate in the range of 5 to 250 kilorads per hour and then at a different dose rate in the range of 1 kilorad per hour to 1 kilorad per second.
Claim 16
Dependent Claim
17 words
The process of claim 1 wherein the total dosage is between about 0.05 to about 100 kilorads.
Claim 17
Dependent Claim
19 words
A process as claimed in claim 1 wherein the total dosage is between about 13 to about 510 kilorads.
Claim 18
Dependent Claim
14 words
A process as claimed in claim 16 wherein the acrylate monomer is 2-ethylhexyl acrylate.
Claim 19
Dependent Claim
19 words
A process as claimed in claim 1 wherein the total dosage is between about 25 to about 300 kilorads.
Claim 20
Dependent Claim
18 words
A process as claimed in claim 1 wherein said viscoelastic polymer mass comprises at least about 95% polymer.
Claim 21
Dependent Claim
18 words
A process as claimed in claim 1 wherein said viscoelastic polymer mass comprises at least about 99.5% polymer.
References Cited (Backward Citations)
US2803598A
Cited
US2803599A
Cited
US2941934A
Cited
US3081244A
Cited
US3897295A
Cited
US3661618A
Cited
US3725115A
Cited
DE2134468A1
Cited
US3772063A
Cited
US3929602A
Cited
US4181752A
Cited
US4151055A
Cited
US4052527A
Cited
US4305854A
Cited
US4234662A
Cited
US4413019A
Cited
US4438177A
Cited
EP0108630A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |