C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
C09J 153/02 (2006.01) C09J 7/02 (2006.01)
Patent
CA 2213298
The present invention provides a block copolymer pressure sensitive adhesive (PSA) composition. The block copolymer has at least one midblock segment and at least one endblock segment. The midblock comprises a polymerized conjugated diene segment or hydrogenated derivative thereof. The endblock comprises a polymerized monovinyl aromatic segment having a number average molecular weight less than about 8,000. The PSA further comprises at least one tackifier or oil that is compatible with the low molecular weight endblock segment of the block copolymer. The PSA composition of the invention has a reduced elastic index and is capable of dissipating stress. This is useful in providing tapes which are capable of withstanding stresses such as those caused by temperature fluctuations, dimensional changes in the backing, or the recovery forces of a backing applied under tension. The present invention also provides a method of reducing the elastic index of a block copolymer PSA composition.
L'invention porte sur une composition auto-adhésive constituée par un copolymère bloc comportant au moins un segment central et un segment d'extrémité. Le bloc central comprend un segment de diène conjugué polymérisé ou l'un de ses dérivés hydrogénés. Le bloc d'extrémité comporte un segment de monovinyle aromatique polymérisé d'un poids moléculaire moyen inférieur à environ 8000. Ladite composition auto-adhésive comporte en outre un agent poisseux ou de l'huile compatible avec le bloc d'extrémité de faible poids moléculaire du copolymère bloc. Ladite composition adhésive qui présente un faible coefficient d'élasticité est capable de dissiper les contraintes; elle sert à produire des rubans pouvant résister à des contraintes liées aux fluctuations de température, aux variations de dimensions du substrat, ou aux forces de recouvrement du substrat appliquées sous tension. L'invention comporte également un procédé de réduction du coefficient d'élasticité d'une composition auto-adhésive constituée par un copolymère bloc.
Ma Jingjing
Nestegard Mark K.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
Pressure sensitive adhesive comprising a block copolymer... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure sensitive adhesive comprising a block copolymer..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure sensitive adhesive comprising a block copolymer... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1727544