摘要:
A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising: (A) a solid alkoxy functional organopolysiloxane resin containing curing radicals of the formula -ZSiR 1 x (OR 2 ) 3-x ; wherein R 1 is a monovalent hydrocarbon radical, R 2 is selected from alkyl radical or alkoxyalkyl radical, Z is a divalent linking radical, and the subscript x has a value of 0 or 1; (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radical selected from the group consisting of alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals; said polymer having a viscosity at 25°C. of 20 to 100,000 mm 2 /s, and the weight ratio of said resin to said polymer being in the range 40:60 to 80:20; and (C) sufficient catalyst to accelerate the cure of said composition; said composition being an essentially solvent-free, non-slump solid at room temperature which cures to an essentially non-tacky elastomer upon exposure to moisture.
摘要:
A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising (i) a solid hydroxyl-functional organopolysiloxane resin comprising R₃SiO 1/2 siloxane units and SiO 4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, respectively, wherein R is selected from hydrocarbon and halogenated hydrocarbon radicals and said hydroxyl content is 1.2 to 6 percent by weight; (ii) an alkoxy-functional diorganopolysiloxane polymer having a viscosity at 25°C. of 20 to 100,000 mPa·s (centipoise), the weight ratio of said resin to said polymer being in the range 40:60 to 80:20; (iii) a silane of the formula R' 4-y SiX y , in which R' is selected from hydrocarbon radicals and substituted hydrocarbon radicals having 1-6 carbon atoms, X is a hydrolyzable group and y is 2 to 4, the amount of said silane being sufficient to provide stability to said composition; and (iv) sufficient catalyst to accelerate the cure of said composition, said composition being an essentially solvent-free, non-slump solid at room temperature which cures to an essentially non-tacky elastomer upon exposure to moisture.
摘要:
A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising (i) a solid hydroxyl-functional organopolysiloxane resin comprising R3SiO1/2 siloxane units and SiO4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, respectively, wherein R is selected from hydrocarbon and halogenated hydrocarbon radicals and said hydroxyl content is 1.2 to 6 percent by weight; (ii) an alkoxy-functional diorganopolysiloxane polymer having a viscosity at 25 DEG C. of 20 to 100,000 mPa.s (centipoise), the weight ratio of said resin to said polymer being in the range 40:60 to 80:20; (iii) a silane of the formula R'4-ySiXy, in which R' is selected from hydrocarbon radicals and substituted hydrocarbon radicals having 1-6 carbon atoms, X is a hydrolyzable group and y is 2 to 4, the amount of said silane being sufficient to provide stability to said composition; and (iv) sufficient catalyst to accelerate the cure of said composition, said composition being an essentially solvent-free, non-slump solid at room temperature which cures to an essentially non-tacky elastomer upon exposure to moisture.
摘要:
A moisture-curable silicone hot-melt adhesive composition is disclosed, which composition comprises
(i) a solid hydroxyl-functional organopolysiloxane resin comprising R₃SiO 1/2 siloxane units and SiO 4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, wherein R is selected from hydrocarbon or halogenated hydrocarbon radicals; (ii) a diorganopolysiloxane polymer having silicon-bonded hydroxyl terminal groups and having a viscosity at 25°C. of 100 to 500,000 mPa·s (centipoise), the weight ratio of said resin (i) to said polymer being (ii) in the range 40:60 to 75:25; (iii) a ketoximosilane, the amount of said ketoximosilane being sufficient to provide a molar ratio of X groups to total hydroxyl groups on said resin (i) and said diorganopolysiloxane (ii) of 0.9 to 3; and (iv) optionally, sufficient catalyst to accelerate the cure of said composition, said composition being an essentially solvent-free non-slump solid at room temperature, being extrudable at ≦150°C. and forming an essentially tack-free elastomer when cured.
摘要:
A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising (i) a solid hydroxyl-functional organopolysiloxane resin comprising R₃SiO 1/2 siloxane units and SiO 4/2 siloxane units in a molar ratio of 0.5/1 to 1.2/1, respectively, wherein R is selected from hydrocarbon and halogenated hydrocarbon radicals and said hydroxyl content is 1.2 to 6 percent by weight; (ii) an alkoxy-functional diorganopolysiloxane polymer having a viscosity at 25°C. of 20 to 100,000 mPa·s (centipoise), the weight ratio of said resin to said polymer being in the range 40:60 to 80:20; (iii) a silane of the formula R' 4-y SiX y , in which R' is selected from hydrocarbon radicals and substituted hydrocarbon radicals having 1-6 carbon atoms, X is a hydrolyzable group and y is 2 to 4, the amount of said silane being sufficient to provide stability to said composition; and (iv) sufficient catalyst to accelerate the cure of said composition, said composition being an essentially solvent-free, non-slump solid at room temperature which cures to an essentially non-tacky elastomer upon exposure to moisture.
摘要:
A pressure sensitive adhesive tape comprising a tape substrate having at least a portion of one or more sides coated with a silicone pressure sensitive adhesive is constructed using an adhesive which cures to a permanent adhesive. The adhesive is covered on the outer side with a release film, preferably coated with a fluorosilicone release layer, to allow storage of the tape. Preferably, the curable silicone pressure sensitive adhesive is cured upon exposure to moisture, the tape therefore being stored in the absence of moisture. A silicone elastomeric structural glazing tape is made by using a silicone elastomer as the tape substrate. The tape can be used to bond glazing panels to building components without the use of other means of fastening.
摘要:
A pressure sensitive adhesive tape comprising a tape substrate having at least a portion of one or more sides coated with a silicone pressure sensitive adhesive is constructed using an adhesive which cures to a permanent adhesive. The adhesive is covered on the outer side with a release film, preferably coated with a fluorosilicone release layer, to allow storage of the tape. Preferably, the curable silicone pressure sensitive adhesive is cured upon exposure to moisture, the tape therefore being stored in the absence of moisture. A silicone elastomeric structural glazing tape is made by using a silicone elastomer as the tape substrate. The tape can be used to bond glazing panels to building components without the use of other means of fastening.
摘要:
A moisture-curable silicone hot melt pressure-sensitive adhesive composition is disclosed, said composition comprising: (A) a solid alkoxy functional organopolysiloxane resin containing curing radicals of the formula -ZSiR x(OR )3-x; wherein R is a monovalent hydrocarbon radical, R is selected from alkyl radical or alkoxyalkyl radical, Z is a divalent linking radical, and the subscript x has a value of 0 or 1; (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radical selected from the group consisting of alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals; said polymer having a viscosity at 25 DEG C. of 20 to 100,000 mm /s, and the weight ratio of said resin to said polymer being in the range 40:60 to 80:20; and (C) sufficient catalyst to accelerate the cure of said composition; said composition being an essentially solvent-free, non-slump solid at room temperature which cures to an essentially non-tacky elastomer upon exposure to moisture.
摘要:
Curable adhesive compositions comprise combinations of organosiloxane MQ resins and liquid polyorganosiloxanes of specified viscosity and functionality. The compositions are substantially free of unreactive materials and are applied in the molten state. Depending upon the concentration of reactive groups on the resin and polyorganosiloxane, the compositions may also include a silane containing an average of more than two hydrolyzable groups per molecule. Preferred compositions develop excellent adhesion to a variety of organic and metallic substrates during curing under ambient conditions.
摘要:
Curable adhesive compositions comprise combinations of organosiloxane MQ resins and liquid polyorganosiloxanes of specified viscosity and functionality. The compositions are substantially free of unreactive materials and are applied in the molten state. Depending upon the concentration of reactive groups on the resin and polyorganosiloxane, the compositions may also include a silane containing an average of more than two hydrolyzable groups per molecule. Preferred compositions develop excellent adhesion to a variety of organic and metallic substrates during curing under ambient conditions.