Non-swelling hot melt adhesive
AssigneeAvery Dennison Corporation
InventorsAnna Cherian, Jarkko T. Pitko
Life of this patent
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Abstract
Provided herein is a hot melt pressure sensitive adhesive comprising one or more styrene block copolymers, a tackifier, and polyisobutylene plasticizer, wherein the adhesive contains less than 1 wt % of a plasticizer oil. The adhesive can be used in a label construction along with a facestock such as a polyethylene facestock, wherein the swelling factor of the facestock is reduced as compared to the swelling factor of the facestock in labels that include a plasticizer oil. Also provided are methods for producing and using the hot melt adhesive, and articles labeled with the hot melt adhesive.
Claims28
A hot melt adhesive comprising:
- one or more styrene block copolymers;
- a tackifier;
- a polyisobutylene;
- and
- a plasticizer oil,
- wherein the number average molecular weight of the polyisobutylene ranges from 700 g/mol to 2500 g/mol, and
- wherein the adhesive is a pressure sensitive adhesive;
- wherein the one or more styrene block copolymers is selected from the group consisting of a styrene isoprene block copolymer, styrene butadiene block copolymer, or combinations thereof;
- and
- the melt index of each of the styrene block copolymers ranges from about 10 g/(10 minute) to about 35 g/(10 minute) measured at 200° C. under pressure of 5 kg weight;
- and
- wherein at least one of the one or more styrene block copolymers is a styrene butadiene block copolymer.
A method of preparing a hot melt adhesive, the method comprising:
- providing one or more styrene block copolymers, a tackifier, a polyisobutylene and a plasticizer oil;
- combining the one or more styrene block copolymers, the tackifier, the polyisobutylene and the plasticizer oil,
- wherein the number average molecular weight of the polyisobutylene ranges from 700 g/mol to 2500 g/mol,
- wherein the adhesive is a pressure sensitive adhesive,
- wherein the one or more styrene block copolymers is selected from the group consisting of a styrene isoprene block copolymer, styrene butadiene block copolymer, or combinations thereof;
- and
- the melt index of each of the styrene block copolymers ranges from about 10 g/(10 minute) to about 35 g/(10 minute) measured at 200° C. under pressure of 5 kg weight;
- and
- wherein at least one of the one or more styrene block copolymers is a styrene butadiene block copolymer.
Dependencies are inferred from the claim text.