Thermally expandable rubber composition
AssigneeSika Technology AG
InventorsCornelia BÖFER, Michael GUTGSELL
Life of this patent
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Abstract
A thermally expandable rubber composition, including a) at least one solid rubber A from the group made of styrene-butadiene rubber, cis-1,4-polybutadiene, synthetic isoprene rubber, natural rubber, ethylene-propylene-diene rubber (EPDM), nitrile rubber, butyl rubber and acrylic rubber; b) processing oil PO, comprising at least one Treated Distillate Aromatic Extract (TDAE); c) at least one vulcanization system VS; d) at least one filler G; e) at least one blowing agent BA selected from the list of bicarbonate, polycarboxylic acids and salts of polycarboxylic acids. The thermally expandable rubber composition provides good adhesion on metal substrates after curing at curing-temperatures around 160° C.
Claims15
A rubber composition, comprising
- a) at least one solid rubber A from the group consisting of styrene-butadiene rubber, cis-1,4-polybutadiene, synthetic isoprene rubber, natural rubber, ethylene-propylene-diene rubber (EPDM), nitrile rubber, butyl rubber and acrylic rubber;
- b) processing oil PO, comprising at least one Treated Distillate Aromatic Extract (TDAE);
- c) at least one vulcanization system VS;
- d) at least one filler G;
- e) at least one blowing agent BA selected from the list of bicarbonate, polycarboxylic acids and salts of polycarboxylic acids.
A method comprising applying a blowing agent BA selected from the list of bicarbonate, polycarboxylic acids and salts of polycarboxylic acids for increasing the adhesion of a rubber composition on metal substrates after curing the rubber composition at a temperature in the range from 150 to 180° C.
Dependencies are inferred from the claim text.