EP0213737A1
Expired / Lapsed
EP
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Pressure-sensitive adhesive tape containing hydrophobic silica
Assignee: 3M Co
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Filing: 1986-07-28
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Granted: —
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Expires: 2006-07-28
Abstract
Abstract By incorporating hydrophobic silica into acrylic pressure-sensitive adhesive tape, the shear strength at elevated temperatures is significantly improved, and adhesion and physical properties are maintained or improved. The hydrophobic silica preferably has a surface area from 50 to 400 m²/g. A preferred acrylic pressure-sensitive adhesive layer comprises a copolymer of (a) at least one alkyl acrylate having an average of 4-12 carbon atoms in its alkyl group and (b) from 3 to 20 % by weight of copolymerizable monomer having a polar group such as acrylic acid.
Inventors
- 👤 Jürgen c/o Minnesota Mining and Klingen
- 👤 Patrick G. C/O Minnesota Mining And Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 16:13
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09J; C09J11/00; C09J11/02; C09J11/04; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/385; C08L; C08L2666/00; C08L2666/54; C09J2301/00; C09J2301/30; C09J2301/302
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
Pressure-sensitive adhesive tape, the adhesive layer which comprises a copolymer of by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, wherein the improvement comprises: the pressure-sensitive adhesive layer includes hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising by weight from 2 to 15 phr.
Claim 2
Dependent Claim
121 words
Pressure-sensitive adhesive tape, the adhesive layer which comprises a copolymer of by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, wherein the improvement comprises: the pressure-sensitive adhesive layer includes hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising by weight from 2 to 15 phr.
Claim 3
Dependent Claim
22 words
Pressure-sensitive adhesive tape as defined in claim 2 wherein the surface area of the hydrophobic filler is from 50 to 400 m²/g.
Claim 4
Dependent Claim
13 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the copolymer is crosslinked.
Claim 5
Dependent Claim
46 words
Pressure-sensitive adhesive tape as defined in claim 1, the adhesive layer of which is filled with glass microbubbles of specific gravity not exceeding 1.0, having an average diameter of 10 to 200 micrometers, and comprising from 10 to 65 volume percent of the pressure-sensitive adhesive layer.
Claim 6
Dependent Claim
22 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the polar group of the copolymerizable monomer (b) is a carboxylic acid group.
Claim 7
Dependent Claim
127 words
Pressure-sensitive adhesive tape, the adhesive layer which comprises a copolymer of by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4 to 12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half of the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, wherein the improvement comprises: the pressure-sensitive adhesive layer includes hydrophobic silica in an amount providing good adhesion and physical properties and a Static Shear Value at 70°C (as herein defined) of at least 2000 minutes.
Claim 8
Dependent Claim
127 words
Pressure-sensitive adhesive tape, the adhesive layer which comprises a copolymer of by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4 to 12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half of the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, wherein the improvement comprises: the pressure-sensitive adhesive layer includes hydrophobic silica in an amount providing good adhesion and physical properties and a Static Shear Value at 70°C (as herein defined) of at least 2000 minutes.
Claim 9
Dependent Claim
18 words
Pressure-sensitive adhesive tape as defined in claim 6 wherein the hydrophilic silica comprises from 2 to 15 phr.
Claim 10
Dependent Claim
24 words
Pressure-sensitive adhesive tape as defined in claim 7 wherein the copolymerizable monomer (b) comprises 3-20 % by weight of said monomers (a) and (b).
Claim 11
Dependent Claim
140 words
Method of making a pressure-sensitive adhesive tape comprising the steps of: (1) preparing a syrup of coatable viscosity using by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, (2) mixing into the syrup hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising from 2 to 15 phr, (3) coating the mixture onto a carrier, and (4) polymerizing the coating to a pressure-sensitive adhesive state.
Claim 12
Dependent Claim
140 words
Method of making a pressure-sensitive adhesive tape comprising the steps of: (1) preparing a syrup of coatable viscosity using by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of at least one copolymerizable monomer having a polar group, (2) mixing into the syrup hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising from 2 to 15 phr, (3) coating the mixture onto a carrier, and (4) polymerizing the coating to a pressure-sensitive adhesive state.
Claim 13
Dependent Claim
19 words
Method as defined in claim 9 wherein a crosslinking agent is added to the mixture prior to step (3).
Claim 14
Dependent Claim
30 words
Method as defined in claim 10 wherein a photoinitiator is added to the mixture prior to step (3), and ultraviolet radiation is employed to effect the polymerizing in step (4).
Claim 15
Dependent Claim
12 words
Method as defined in claim 11 wherein the crosslinking agent is photoactivatable.
Claim 16
Dependent Claim
144 words
Method of making a pressure-sensitive adhesive tape comprising the steps of: (1) forming a solution of polymerizable composition comprising by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of a least one copolymerizable monomer having a polar group, (2) adding to the solution hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising from 2 to 15 phr, (3) polymerizing the composition, (4) coating the polymer onto a carrier, and (5) drying the coating to a pressure-sensitive adhesive state.
Claim 17
Dependent Claim
144 words
Method of making a pressure-sensitive adhesive tape comprising the steps of: (1) forming a solution of polymerizable composition comprising by weight (a) a major proportion of acrylic acid ester of nontertiary alkyl alcohol, the molecules of which have from 1 to 14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, and (b) a minor proportion of a least one copolymerizable monomer having a polar group, (2) adding to the solution hydrophobic silica having a surface area of at least 10 m²/g and in an amount comprising from 2 to 15 phr, (3) polymerizing the composition, (4) coating the polymer onto a carrier, and (5) drying the coating to a pressure-sensitive adhesive state.
Claim 18
Dependent Claim
16 words
Method as defined in claim 13 wherein a crosslinking agent is added prior to step (4).
References Cited (Backward Citations)
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