US4726982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tackified acrylic pressure-sensitive adhesive and composite article
Assignee: 3M Co
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Filing: 1987-04-10
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Granted: 1988-02-23
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Expires: 2007-04-10
Abstract
Abstract A pressure-sensitive adhesive that has high cohesive strength and adheres permanently to high-solids automotive paint systems preferably comprises a mixture of (1) a crosslinked acrylic copolymer of acrylic acid ester and N-vinyl-2-pyrrolidone, and (2) certain tackifier resins. Useful tackifier resins are poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resins such as a t-butylated styrene. The tackifier resin preferably has a T g of at least 30° C., M n from 300 to 3000, and a solubility parameter from 8 to 9. The novel pressure-sensitive adhesive is particularly useful as a dense surface layer of a composite tape having a foamlike core.
Inventors
- 👤 William J. Traynor
- 👤 Cheryl L. Moore
- 👤 Michael K. Martin
- 👤 John D. Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C09J139/00; C09J139/04; C09J139/06; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/38; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249983; Y10T428/249984; Y10T428/249985; Y10T428/28; Y10T428/2852; Y10T428/2878; Y10T428/2887; Y10T428/2891
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
Pressure-sensitive adhesive comprising by weight a blend of (1) an acrylic copolymer of monomers comprising (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 2
Dependent Claim
146 words
Pressure-sensitive adhesive comprising by weight a blend of (1) an acrylic copolymer of monomers comprising (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 3
Dependent Claim
21 words
Pressure-sensitive adhesive as defined in claim 1 wherein said tackifier resin (2) has a T g of at least 30° C.
Claim 4
Dependent Claim
20 words
Pressure-sensitive adhesive as defined in claim 1 wherein said tackifier resin (2) has a M n from 300 to 3000.
Claim 5
Dependent Claim
25 words
Pressure-sensitive adhesive as defined in claim 1 wherein said tackifier resin (2) has a solubility parameter from 8 to 9 (cal/cm 3 ) 1/2 .
Claim 6
Dependent Claim
30 words
Pressure-sensitive adhesive as defined in claim 4 wherein the tackifier resin has from 90 to 20 wgt. % aromatic content and correspondingly from 10 to 80 wgt. % aliphatic content.
Claim 7
Dependent Claim
12 words
Pressure-sensitive adhesive as defined in claim 1 wherein the N-vinyl-lactam comprises N-vinyl-2-pyrrolidone.
Claim 8
Dependent Claim
12 words
Pressure-sensitive adhesive as defined in claim 1 wherein the N-vinyl-lactam comprises N-vinyl-caprolactam.
Claim 9
Dependent Claim
182 words
Pressure-sensitive adhesive tape comprising a foam or foamlike core having a thickness of at least 0.3 mm and a dense, pressure-sensitive adhesive surface layer which is thinner than the core, the pressure-sensitive adhesive of the surface layer comprising a blend of (1) a copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) at least one of N-vinyl-2-pyrrolidone and N-vinyl-caprolactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin in an amount from about 5 to 50 parts per hundred parts of the copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifying resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 10
Dependent Claim
182 words
Pressure-sensitive adhesive tape comprising a foam or foamlike core having a thickness of at least 0.3 mm and a dense, pressure-sensitive adhesive surface layer which is thinner than the core, the pressure-sensitive adhesive of the surface layer comprising a blend of (1) a copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) at least one of N-vinyl-2-pyrrolidone and N-vinyl-caprolactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin in an amount from about 5 to 50 parts per hundred parts of the copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifying resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 11
Dependent Claim
32 words
Pressure-sensitive adhesive tape as defined in claim 8 wherein the core is foamlike by comprising pressure-sensitive adhesive in which are dispersed microbubbles comprising from 5 to 65 volume percent of the core.
Claim 12
Dependent Claim
24 words
Pressure-sensitive adhesive tape as defined in claim 9 wherein the thickness of said dense, pressure-sensitive adhesive surface layer is no greater than 0.2 mm.
Claim 13
Dependent Claim
25 words
Pressure-sensitive adhesive tape as defined in claim 9 wherein the foamlike core is substantially free from voids other than the hollow spaces in the microbubbles.
Claim 14
Dependent Claim
19 words
Pressure-sensitive adhesive tape as defined in claim 8 wherein the core is a foam comprising a cellular pressure-sensitive adhesive.
Claim 15
Dependent Claim
16 words
Pressure-sensitive adhesive tape as defined in claim 8 wherein the core comprises a foamed thermoplastic resin.
Claim 16
Dependent Claim
155 words
Pressure-sensitive adhesive tape comprising a flexible backing carrying a layer of pressure-sensitive adhesive comprising a blend of (1) an acrylic copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 17
Dependent Claim
155 words
Pressure-sensitive adhesive tape comprising a flexible backing carrying a layer of pressure-sensitive adhesive comprising a blend of (1) an acrylic copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high-solids automotive paint systems.
Claim 18
Dependent Claim
13 words
Pressure-sensitive adhesive tape as defined in claim 14 wherein the N-vinyl-lactam comprises N-vinyl-2-pyrrolidone.
Claim 19
Dependent Claim
153 words
Decorative or protective article having a layer of pressure-sensitive adhesive comprising a blend of (1) an acrylic copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high solids automotive paint systems.
Claim 20
Dependent Claim
153 words
Decorative or protective article having a layer of pressure-sensitive adhesive comprising a blend of (1) an acrylic copolymer of by weight (a) acrylic acid ester of nontertiary alkyl alcohol, the alkyl groups of which have an average of about 4 to 14 carbon atoms, said acrylic acid ester being per se polymerizable to a sticky, stretchable, elastic adhesive mass, and (b) N-vinyl-lactam in an amount comprising from 10 to 40 parts of the total monomers (a) and (b), and (2) tackifier resin selected from at least one of poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resin and in an amount from about 5 to 50 parts per hundred parts of the acrylic copolymer (1), said copolymer having a monomer conversion factor exceeding 95% and being crosslinked as evidenced by at least 50% gel in THF, the tackifier resin enhancing permanent adhesion of the pressure-sensitive adhesive to high solids automotive paint systems.
Claim 21
Dependent Claim
14 words
Decorative or protective article as defined in claim 16 wherein the N-vinyl-lactam comprises N-vinyl-2-pyrrolidone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |