GLUE COMPOSITIONS CONTAINING BLOCK POLYMER MIXTURES Russian patent published in 2009 - IPC C09J153/02 

FIELD: chemistry.

SUBSTANCE: glue composition contains at least two block polymers (i), tackifying resin (ii) and one or more plasticiser (iii). The component (i) includes at least one block polymer (i)(a) of formula A-I-A (1) or (A-I)_nX (2) and at least one block polymer (i)(b) of formula A-(I/B)-A (3) or [A-(I/B)]_n-X (4) whereat every A is independently polymer block of the aromatic vinyl compound, I is polyisoprene polymer block, every (I/B) is mixed block of random isoprene-butadiene polymer, n is integer number not less than 2, X is the radical of the curing agent, the total butadiene content in the component (i) is less than 20% wt. The mass ratio I:B in the block polymer (i)(b) is from 20:80 to 80:20. The component (ii) is tackifying resin selected from modified aliphatic C5-hydrocarbon resins which are not aromatic modified resins. The paraffin and naphtene plasticising oils are suitable plasticisers.

EFFECT: enhanced heat stability and high glue properties of the composition.

11 cl, 2 tbl, 7 ex