Hot melt type seal agent for a lamp
AssigneeAica Kogyo Co., Ltd.
InventorsAtsushi Tomita, Hidekatsu Sumi
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Abstract
The present invention relates to the hot melt type seal agent for adhering and sealing a head lamp of a vehicle, wherein a lens and a housing are integrally one unit. The necessary component materials of the hot melt type seal agent of the present invention include a mixture produced by butyl rubber, SEBS block copolymer and olefin with high softening point. The hot melt type seal agent of the present invention withstands temperature changes in the head lamp and the gas pressure that is filled therein. Consequently, good adhesion, waterproof and high gas-tight performances are achieved.
Claims9
A hot melt type seal agent for a lamp comprising butyl rubber, styrene-ethylene-butylene-styrene block copolymer and olefin wax with a softening point higher than 110.degree. C., the seal agent having a softening point higher than 110.degree. C. measured by the ring and ball method, wherein the weight ratio of said butyl rubber to said block copolymer is between 90:10 and 40:60, and the amounts by weight of (1) said butyl rubber plus said block copolymer and (2) said olefin wax are from 20 to 50% and 5 to 30%, respectively, said seal agent further includes 0.5 to 5 weight % of a silane coupling agent.
Dependencies are inferred from the claim text.