Self-wetting adhesive composition
Assignee3M Innovative Properties Company
InventorsAnn R. Fornof, James P. DiZio
Life of this patent
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Abstract
A self-wetting adhesive composition is described comprising the reaction product of a low Tg (meth)acrylate solute copolymer component; a low Tg solvent monomer solvent monomer component comprising low Tg monomers, a multifunctional acrylate; and a polymerizable siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment.
Claims27
A syrup polymer composition comprising:
- a) 5 to 40 parts by weight of a low Tg (meth)acrylate solute copolymer component;
- b) 60 to 95 parts by weight of a low Tg solvent monomer solvent monomer component comprising low Tg monomers and a multifunctional acrylate;
- the sum of a) and b) being 100 parts by weight;
- c) 5 to 50 parts by weight, relative to a) and b) of a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment relative to 100 parts a) and b).
The syrup polymer composition of any of the previous claims wherein the solute copolymer comprises:
- a) 95-100 parts by weight of low Tg monomer units;
- b) 0 to 5 parts of acid-functional monomer units;
- c) 0 to 5 parts of a non-acid functional polar monomer the sum being 100 parts by weight.
The syrup polymer composition of any of the previous claims wherein the solvent monomer component comprises:
- a) 60 to 90 parts by weight of low Tg monomers;
- b) 0 to 5 parts of acid functional monomers;
- c) 10 to 40 parts of a multiacrylate;
- the sum being 100 parts by weight.
The syrup polymer composition of any of the previous claims comprising 20 to 50 parts of a siloxane copolymer, relative to 100 parts a) and b).
The syrup polymer composition of any of the previous claims wherein the solute low Tg copolymer comprises 1 to 5 parts by weight of acid-functional monomer units and 5 to 95 parts by weight of low Tg monomer units.
The syrup polymer composition of any of the previous claims wherein the solute low Tg copolymer comprises 1 to 5 parts by weight of non-acid-functional monomer units.
The syrup polymer composition of any of the previous claims wherein the solvent monomer component comprises 1 to 5 parts by weight of acid-functional monomer units.
The syrup polymer composition of any of the previous claims wherein the solute low Tg copolymer comprises 100 parts by weight of low Tg monomer units.
The syrup polymer composition of any of the previous claims wherein the solute low Tg copolymer has a Tg of less than 0° C., preferably less than −20° C., more preferably less than −50° C.
The syrup polymer composition of any of the previous claims wherein the segmented siloxane copolymer comprises at least two (meth)acrylate groups.
An adhesive comprising the cured syrup polymer composition of any of the previous claims.
A method of making an adhesive comprising the steps of:
- partially polymerinzing a low Tg monomer and optional acid functional monomer to a viscosity produce a syrup polymer composition, adding a multifunctional acrylate crosslinker agent, optional additional monomers, and a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment, and further photopolymerizing.
An adhesive comprising
- a) 10 to 40 parts by weight of a low Tg (meth)acrylate solute copolymer component;
- b) 60 to 90 parts by weight of a crosslinked low Tg solvent copolymer component;
- and
- c) 5 to 50 parts by weight a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment, relative to a) and b).
Dependencies are inferred from the claim text.