Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A porous film as obtainable by the process comprising adding from 40 to 250 parts by weight of a finely-powdered filler having an average particle size of from 0.3 to 4 µ m to 100 parts by weight of a polylactic acid-base resin composition comprising from 80 to 100 % by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20 % by weight of a plasticizer, melting and film-forming the resultant mixture, and successively stretching the thus-obtained film 1.1 times or more to at least one direction of the axis.
Claim 2
Dependent Claim
60 words
The porous film of claim 1 wherein polylactic acid comprises from 85 to 100 % by mole of an L-lactic acid unit and from 0 to 15 % by mole of a D-lactic acid unit, or from 85 to 100 % by mole a D-lactic acid unit and from 0 to 15 % by mole of an L-lactic acid unit.
Claim 3
Dependent Claim
64 words
The porous film of claim 1 wherein the lactic acid-hydroxycarboxylic acid copolymer comprises from 85 to 100 % by mole of an L-lactic acid unit and from 0 to 15 % by mole of a glycolic acid unit, or from 85 to 100 % by mole of a D-lactic acid unit and from 0 to 15 % by mole of a glycolic acid unit.
Claim 4
Dependent Claim
22 words
The porous film of any one of the preceding claims wherein the plasticizer is lactic acid, a lactic acid oligomer or lactide.
Claim 5
Dependent Claim
17 words
The porous film of any one of the preceding claims wherein the finely-powdered filler is inorganic powder.
Claim 6
Dependent Claim
100 words
A porous film of claim 1 wherein polylactic acid (A) comprises from 85 to 100 % by mole of an L-lactic acid unit and from 0 to 15 % by mole of a D-lactic acid unit, the lactic acid-hydroxycarboxylic acid copolymer (B) comprises from 85 to 100 % by mole of an L-lactic unit or from 85 to 100 % by mole of a D-lactic acid unit and from 0 to 15 % by mole of a glycolic acid unit, the plasticizer (C) is lactic acid, a lactic acid oligomer or lactide, and the finely-powdered filler (D) is inorganic powder.
Claim 7
Dependent Claim
22 words
The porous film of any one of the preceding claims wherein the finely-powdered filler is barium sulfate, calcium carbonate or magnesium oxide.
Claim 8
Dependent Claim
27 words
The porous film of any one of the preceding claims wherein the melting and film-forming is carried out in the temperature range of from 100 to 270°C.
Claim 9
Dependent Claim
37 words
The porous film of any one of the preceding claims wherein the stretching is carried out in the range of from the glass transition temperature of the lactic acid-base polymer to said glass transition temperature + 50°C.
Claim 10
Dependent Claim
105 words
A process for producing a porous film of any one of the preceding claims by the proces comprising adding from 40 to 250 parts by weight of a finely-powdered filler having an average particle size of from 0.3 to 4 µ m to 100 parts by weight of a polylactic acid-base resin composition comprising from 80 to 100 % by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20 % by weight of a plasticizer, melting and film-forming the resultant mixture, and successively stretching the thus-obtained film 1.1 times or more to at least one direction of the axis.