| 摘要 |
The invention relates to a heat-sealing adhesive, which comprises a mixture of: a) 20-60% by weight of nonadhesive (meth)acrylic acid ester-(meth)acrylic acid copolymers, which contain (meth)acrylic acid ester units with 2-8 carbon atoms in the alcohol component and, relative to these copolymers, 1-10% by weight of (meth)acrylic acid, with a melting temperature in the range of 115 to 150 and a K value according to Fikentscher in the range of 70 to 110 (measured according to DIN 51562 in tetrahydrofuran), b) 10-50% by weight of self-adhesive acrylic acid esteracrylic acid copolymers, which contain acrylic acid ester units with 2-8 carbon atoms in the alcohol component and, relative to these copolymers, 1-10% by weight of acrylic acid, with a glass transition temperature TG in the range of -45 DEG to -10 DEG C., a K value according to Fikentscher in the range of 70 to 120 (measured according to DIN 51562 in tetrahydrofuran) and a softening temperature in the range of 50 DEG to 100 DEG C., and c) 10-50% by weight of polyethylene with an average molecular weight of 1000-10000 as well as optionally usual additives. It is suitable for the production of paper heat-sealing adhesive tapes, which can be used for restoration and preservation of paper substrates.
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