Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A process for producing a micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer which comprises the steps of: (A) forming a gel-like object from a solution of an alpha-olefin polymer having a weight-average molecular weight of about 5 x10 5 or greater, (B) removing at least 10 to 90 wt% of the solvent contained in the gel-like object, (C) orientating the gel-like object obtained from step (B) at a temperature lower than that which is 10°C above melting point of the alpha-olefin polymer, and (D) removing the residual solvent from the orientated product thereby obtaining a micro-porous membrane.
Claim 2
Dependent Claim
96 words
A process for producing a micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer which comprises the steps of: (A) forming a gel-like object from a solution of an alpha-olefin polymer having a weight-average molecular weight of about 5 x10 5 or greater, (B) removing at least 10 to 90 wt% of the solvent contained in the gel-like object, (C) orientating the gel-like object obtained from step (B) at a temperature lower than that which is 10°C above melting point of the alpha-olefin polymer, and (D) removing the residual solvent from the orientated product thereby obtaining a micro-porous membrane.
Claim 3
Dependent Claim
13 words
The process in accordance with claim 1 wherein the alpha-olefin polymer is polypropylene.
Claim 4
Dependent Claim
68 words
A micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer having a weight-average molecular weight of about 5 x 10 or greater, said micro-porous membrane having through holes 0.1 to 1 micrometer in average pore size, with a void ratio of from about 30 to 90% and being orientated such that the linear draw ratio in one axis is greater than two and the areal draw ratio is greater than 10.
Claim 5
Dependent Claim
68 words
A micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer having a weight-average molecular weight of about 5 x 10 or greater, said micro-porous membrane having through holes 0.1 to 1 micrometer in average pore size, with a void ratio of from about 30 to 90% and being orientated such that the linear draw ratio in one axis is greater than two and the areal draw ratio is greater than 10.
Claim 6
Dependent Claim
14 words
The micro-porous membrane in accordance with claim 1 wherein the alpha-olefin polymer is polypropylene.
Claim 7
Dependent Claim
102 words
A process for producing film of ultra-high-molecular-weight alpha-olefin polymer which comprises the steps of: (A) forming a gel-like object from a solution an alpha-olefin polymer having a weight-average molecular weight of about 5 x 10 or greater, (B) removing from 10 wt% to 90 wt% of the solvent contained in the gel-like object, (C) orientating the gel-like object at a temperature lower than that which is 10°C above the melting point of the alpha-olefin polymer, (D) removing the residual solvent from the orientated product, and (E) pressing the orientated product at a temperature lower than the melting point of the alpha-olefin polymer.
Claim 8
Dependent Claim
102 words
A process for producing film of ultra-high-molecular-weight alpha-olefin polymer which comprises the steps of: (A) forming a gel-like object from a solution an alpha-olefin polymer having a weight-average molecular weight of about 5 x 10 or greater, (B) removing from 10 wt% to 90 wt% of the solvent contained in the gel-like object, (C) orientating the gel-like object at a temperature lower than that which is 10°C above the melting point of the alpha-olefin polymer, (D) removing the residual solvent from the orientated product, and (E) pressing the orientated product at a temperature lower than the melting point of the alpha-olefin polymer.
Claim 9
Dependent Claim
13 words
The process in accordance with claim 1 wherein the alpha-olefin polymer is polypropylene.