Appeal No. 1997-3282
Application No. 08/189,314
3 o
0.80 to 0.90 g/cm , a melting point of lower than 80
C., a brittle temperature of lower than -70 C.o
according to ASTM D 746 test and a hardness of lower
than 70 according to JIS K 6301 test. In this
connection, it should be noted that the ethylene-
alpha olefin copolymers free from the physical
properties as difined [sic, defined] just above, for
instance those having a brittle temperature of no
less than -70 C. or a melting point of no less thano
80 C. exhibit considerably poor releasability ando
is, therefore; of practical useless [sic].
The ethylene-alpha olefin copolymers used in the
present invention include copolymers comprising two
or more alpha olefins such as ethylene, propylene,
1-butene, 1-pentene, 3-methyl-1-butene, 1 -hexane,
3-methyl-1-pentene, 4-methyl-1pentene etc., or a
mixture thereof. Among others, preferred are a
random copolymer of [ethylene]-1-butene and a
copolymer of ethylene/propylene or a mixture
thereof.
In addition to the above-mentioned components,
the polyolefinic elastomers a according to the
present invention, may contain polyolefin waxes and
olefinic copolymers having a crystallinity of less
than 30% and graft-modifies by unsaturated
carboxylic acids or their derivatives without
departing from the ranges as above defined on the
shearing modulus and surface wettability. As the
polyolefin waxes, use may be made of wax obtained by
polymerization of ethylene or propylene or wax
obtained by thermal cracking of ethylene or
propylene. As the olefin copolymers having a
crystallinity of less than 30%, mentioned are
copolymers comprising two or more alpha olefins such
as ethylene, propylene, 1-butene, 1-pentene, 3-
methyl-1-butene, 1-hexane, 3-methyl-1-pentene, 4-
methyl-1-[pentene] etc., or a mixture thereof, said
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