Latex compositions and uses thereof
AssigneeUniversity of Ottawa
InventorsMarc Arnold Dube, Lili Qie
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Abstract
The present technology provides a latex comprising: a mixture of microgels and sol polymers of an acrylic copolymer, wherein the Mc of the acrylic copolymer is greater than or equal to the Me thereof; the Mw of the sol polymers is greater than or equal to twice the Me of the acrylic copolymer; the amount of sol polymer having a Mw less than twice the Me of the acrylic copolymer is about 20 wt % or less than 20 wt %. Such lattices may be used to form films for use as adhesives such as pressure sensitive adhesives. Also provided are methods for manufacturing the films and adhesives.
Claims18
A latex comprising:
- a mixture of microgels and sol polymers of an acrylic copolymer, wherein
- the Mc of the acrylic copolymer is greater than or equal to the Me thereof;
- the Mw of the sol polymers is greater than or equal to twice the Me of the acrylic copolymer;
- the amount of sol polymer having a Mw less than twice the Me of the acrylic copolymer is about 20 wt % or less than 20 wt %;
- wherein the acrylic copolymer comprises copolymerized monomers of
- a low Tg acrylic monomer,
- a high Tg monomer, and
- a hydroxyl-containing acrylic monomer;
- and
- wherein the acrylic copolymer further comprises a cross-linker wherein the cross-linker is a copolymerized acrylic monomer containing a second carbon-carbon double bond.
A method of manufacturing a latex comprising:
- polymerizing a monomer emulsion comprising water, a low Tg acrylic monomer, a high Tg monomer, a hydroxyl-containing acrylic monomer, and a cross-linker which is a copolymerized acrylic monomer containing a second carbon-carbon double bond, to provide a latex comprising a mixture of microgels and sol polymers of an acrylic copolymer;
- and
- wherein
- the Mc of the acrylic copolymer is greater than or equal to the Me thereof;
- the Mw of the sol polymers is greater than or equal to twice the Me of the acrylic copolymer;
- the amount of sol polymer having a Mw less than twice the Me of the acrylic copolymer is about 20 wt % or less than 20 wt %.
A film formed from a latex comprising:
- a mixture of microgels and sol polymers of an acrylic copolymer, wherein
- the Mc of the acrylic copolymer is greater than or equal to the Me thereof;
- the Mw of the sol polymers is greater than or equal to twice the Me of the acrylic copolymer;
- the amount of sol polymer having a Mw less than twice the Me of the acrylic copolymer is about 20 wt % or less than 20 wt %;
- wherein the acrylic copolymer comprises copolymerized monomers of
- a low Tg acrylic monomer,
- a high Tg monomer, and
- a hydroxyl-containing acrylic monomer;
- and
- wherein the acrylic copolymer further comprises a cross-linker wherein the cross-linker is copolymerized acrylic monomer containing a second carbon-carbon double bond.
A method of manufacturing a film comprising casting a latex into a film and drying the film wherein the latex comprises:
- a mixture of microgels and sol polymers of an acrylic copolymer, wherein
- the Mc of the acrylic copolymer is greater than or equal to the Me thereof;
- the Mw of the sol polymers is greater than or equal to twice the Me of the acrylic copolymer;
- the amount of sol polymer having a Mw less than twice the Me of the acrylic copolymer is about 20 wt % or less than 20 wt %;
- wherein the acrylic copolymer comprises copolymerized monomers of
- a low Tg acrylic monomer,
- a high Tg monomer, and
- a hydroxyl-containing acrylic monomer;
- and
- wherein the acrylic copolymer further comprises a cross-linker wherein the cross-linker is a copolymerized acrylic monomer containing a second carbon-carbon bond.
Dependencies are inferred from the claim text.