Block copolymer melt-processable compositions, methods of their preparation, and articles therefrom
Assignee3M Innovative Properties Company
InventorsAlbert I. Everaerts, JingJing Ma, Ashish K. Khandpur, Francois C. D'Haese, Jianhui Xia, Lang N. Nguyen
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Abstract
Described are melt-processable block copolymers and compositions, embodiments of which may be useful in applications such as pressure sensitive adhesive (PSA) or heat-activatable adhesive, comprising polymeric end block and polymeric B block, wherein end block comprises copolymer and the B block comprises homopolymer or copolymer.
Claims27
A method of preparing a poly(meth)acrylate block copolymer, having meltflow temperature in the range from 50° C. to 250° C., the method comprising:
- reacting at least one low glass transition temperature polymeric block and at least one high glass transition temperature copolymeric end block comprising first monomeric units and second monomeric units to form the block copolymer, wherein the low glass transition temperature polymeric block has a glass transition temperature of less than about 20° C., and the high glass transition temperature copolymeric end block has a glass transition temperature of at least about 20° C., and
- selecting the second monomeric units to increase or decrease meltflow temperature of the block copolymer compared to a block copolymer that is otherwise similar but does not contain the second monomeric units,
- wherein at least one of the low glass transition temperature polymeric block and the high glass transition temperature copolymeric end block is derived from one or more (meth)acrylate monomer.
A melt-processable poly(meth)acrylate block copolymer, the block copolymer comprising
- at least one high glass transition temperature copolymeric end block having a glass transition temperature of at least about 20° C., and
- at least one low glass transition temperature polymeric block having a glass transition temperature of less than about 20° C.,
- wherein high glass transition temperature copolymeric end block comprises first monomeric units and second monomeric units, the second monomeric units increasing or decreasing meltflow temperature of the block copolymer compared to a similar block copolymer that does not contain the second monomeric units,
- wherein at least one of the high glass transition temperature copolymeric end block and the low glass transition temperature polymeric block is derived from one or more (meth)acrylate monomer, and
- the meltflow temperature of the block copolymer is in the range from 50° C. to 250° C.
A melt processable, thermoplastic poly(meth)acrylate block copolymer comprising
- at least one soft polymeric block having a glass transition temperature of less than about 20° C., and
- at least two hard copolymeric end blocks having a glass transition temperature of from 20° C. to 200° C. and comprising
- first monomeric units selected from the group consisting of linear and branched alkyl(meth)acrylates, cycloaliphatic monomeric units, and aromatic monomeric units, and
- second monomeric units selected from the group consisting of cycloaliphatic monomeric units, aromatic monomeric units, and low glass transition temperature linear or branched alkyl acrylate or alkyl methacrylate monomeric units, and
- wherein the block copolymer has a meltflow temperature in the from 50° C. to 250° C.
A melt processable, thermoplastic block copolymer comprising
- at least one soft polymeric block having a glass transition temperature of less than about 20° C., and
- at least two hard copolymeric end blocks having a glass transition temperature of from 20° C. to 200° C. and comprising
- first monomeric units selected from the group consisting of ethylenically unsaturated polymerizable cycloaliphatic monomeric units, and
- second monomeric units selected from the group consisting of ethylenically unsaturated polymerizable aromatic monomeric units, and
- wherein the block copolymer has a meltflow temperature in the range from 50° C. to 250° C.
Dependencies are inferred from the claim text.