UV-crosslinkable acrylic hotmelt PSAs with narrow molecular weight distribution
AssigneeTesa SE
InventorsMarc Husemann, Stephan Zöllner
Life of this patent
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Abstract
A polyacrylate pressure sensitive adhesive, having an average molecular weight Mw (weight average) of from 100 000 to 600 000 g/mol a polydispersity of not more than 3.0 copolymerized photoinitiator units, and a process for preparing a UV-crosslinkable polyacrylate pressure sensitive adhesive having a polydispersity of not more 3.0, comprising a radical polymerization process for preparing a polymer from a monomer mixture, the monomer mixture to be polymerized comprising copolymerizable photoinitiators, the polymerization process being regulated by the presence of at least one chemical compound comprising the unit in which X is S, O or N as polymerization regulator.
Claims20
A polyacrylate pressure sensitive adhesive having
- an average molecular weight Mw (weight average) of from 100 000 to 600 000 g/mol
- a polydispersity of not more than 3.0
- copolymerized photoinitiator units.
A process for preparing a UV-crosslinkable polyacrylate pressure sensitive adhesive having a polydispersity of not more 3.0, comprising
- a radical polymerization process for preparing a polymer from a monomer mixture,
- the monomer mixture to be polymerized comprising copolymerizable photoinitiators,
- the polymerization process being regulated by the presence of at least one chemical compound comprising the unit —S—C═X, in which X is S, O or N.
A process for preparing acrylic pressure sensitive adhesives, which comprises polymerizing a monomer mixture comprising at least the following components:
- (a) 68-99.9% by weight of acrylates, methacrylates, their free acids, or a mixture thereof, of the following formula
- CH2═CH(R1)(COOR2),
- where R1 is H or CH3 and R2 is an alkyl chain having from 1 to 30 carbon atoms or H,
- (b) 0.05-2% by weight of copolymerizable UV photoinitiators containing a radically polymerizable double bond.
Dependencies are inferred from the claim text.