Non-swelling sealing material and method of preparing the same
AssigneeSunrise MSI Corporation
InventorsYoshinori Nakano, Sukehide Fujimoto
Life of this patent
Estimating the term…
Abstract
1 mole of 4,4′-diphenylmethane diisocyanate is mixed with 2 moles of polyoxypropyelene glycol monoether having mean molecular weight of 2800 while adding 0.03% of tin octylate as a catalyst, and reaction is made at 80° C. for three hours for obtaining a synthetic. This synthetic is employed as a main component and blended with a filler and the like for obtaining a sealing material composite. This composite causes no swelling of a gasket forming a flange part of a trunk lid of an automobile.
Claims12
A non-swelling, sealing material which maintains viscosity comprising:
- a viscous liquid compound which is substantially non-reactive having at least two alkyl ether end groups having a carbon number of 3 to 8 in one molecule, a urethane bond in a principal chain of the viscous liquid compound and a powder filler contained therein for compounding,
- wherein said non-swelling, sealing material does not contain an oil extender, and is obtained by reaction between a low molecular weight polyisocyanate compound having at least two isocyanate groups in one molecule and polyalkylene oxide monoether having a hydroxyl group only on one end,
- said polyalkylene oxide monoether having a molecular weight of 1000 to 5000 and is prepared from a compound having at least one alkyl ether end group with a carbon number of 3 to 8, said the alkyl ether group is a member selected from the group consisting of a methyl ether group, an ethyl ether group, a butyl ether group, a n-hexyl ether group, a n-octyl ether group, a 2-ethyl hexyl ether group and a n-decal ether group.
A method of preparing a non-swelling sealing material by reacting a low molecular weight polyisocyanate compound having at least two isocyante groups in one molecule with polyalklene oxide monoether having a hydroxyl group only in one end in such a molar ratio that said hydroxyl group is equimolar with or slightly in excess of said isocyanate groups for synthesizing a compound, and thereafter blending said synthesized compound with a power filler
- said polyalkylene oxide monoether having a molecular weight of 1000 to 5000 and is prepared from a compound having at least one alkyl ether end group with a carbon number of 3 to 8, said the alkyl ether group is a member selected from the group consisting of:
- a methyl ether group, an ethyl ether group, a butyl ether group, a n-hexyl ether group, a n-octyl ether group, a 2-ethyl hexyl ether group and a n-decal ether group.
A method of preparing, a non-swelling sealing material by reacting a compound having at least two alkyl ether end groups having a carbon number of 3 to 8 in one molecule with a molecule principal chain part consisting of a polyalkylene oxide structure and at least two molecule end parts of isocyanate groups with short-chain monoalcohol is such a molar ratio that a hydroxyl group of said monoalcohol is equimoloar with or slightly in excess of said isocyanate groups for synthesizing a viscous liquid compound, and thereafter blending said synthesized compound with a power filler
- said polyalkylene oxide is a polyalkylene oxide monoether having a molecular weight of 1000 to 5000 and is prepared from a compound having at least one alkyl ether end group with a carbon number of 3 to 8 said the alkyl ether group is a member selected from the group consisting of:
- a methyl ether group, an ethyl ether group, a butyl ether group, a n-hexyl ether group, a n-octyl ether group, a 2-ethyl hexyl ether group and a n-decal ether group.
Dependencies are inferred from the claim text.