PRESSURE-SENSITIVE ADHESIVES HAVING TEMPERATURE-STABLE ADHESIVE POWER Russian patent published in 2013 - IPC C09J175/08 C08L75/04 C09J7/02 C08G18/10 

FIELD: chemistry.

SUBSTANCE: adhesive composition contains the following components: A) a mixture consisting of 20-85% polyurethane and 15-80% adhesion enhancing resin with number-average molecular weight of 200-5000 Da, B) 0.01-3% cross-linking catalyst. The polyurethane contains 2 hydrolysable alkoxysilane end groups and has the following formula: , where: R¹ is a divalent hydrocarbon radical containing 5-15 carbon atoms; R² is a divalent alkylene radical containing 1-4 carbon atoms; R³ is a divalent linear alkylene radical containing 1-3 carbon atoms; R⁴ and R⁵ is an alkyl radical containing 1-4 carbon atoms; n is an integer which is such that the number-average molecular weight of the polyether block of formula -[OR²]_n- ranges from 300 Da to 30 kDa; m is an integer which is such that the number-average molecular weight of polyurethane ranges from 600 Da to 60 kDa; p equals 0, 1 or 2. A self-adhesive base is obtained by heating the adhesive composition at temperature in the range of 50 to 130°C, depositing the composition on a base layer and cross-linking the composition by heating the coated base at temperature of 50 to 150°C.

EFFECT: invention increases adhesive power of the composition which can be stored in a wide temperature range.

10 cl, 1 tbl, 8 ex