公开(公告)号：JPH11268116A

公开(公告)日：1999-10-05

申请号：JP2797799

申请日：1999-02-04

Applicant: AGENCY IND SCIENCE TECHN

Inventor： NAKAYAMA KAZUO ,  YASUKO KODAMA ,  SAI KON ,  LEON TEBEIK

IPC: C08J5/18 ,  B29C55/04 ,  B29C55/18 ,  B29K67/00 ,  B29L7/00 ,  C08L67/04 ,  C08L101/16

Abstract: PROBLEM TO BE SOLVED: To impart molecular chain orientation by drawing a sheet of a polymeric compsn. comprising polylatic acid from the gap between a pair of rolls heated to a specific temp. to apply a stretching ratio of three times or more to the sheet uniaxially. SOLUTION: The m.p. (peak temp. of DSC) of polylactic acid being a raw material is 174 deg.C and the glass transition temp. thereof is 68 deg.C. This polylactic acid is dried for 24 hr or more under vacuum and the compsn. comprising 100 wt. % of this polylactic acid is heated and melted at a temp. of 205 deg.C in a twine-screw extruder to be kneaded. This polylactic acid is extruded into a sheet from a T-die with a width of 60 mm and a gap of 1.05 mm and cooled in water to be taken up. The sheet 3 thus obtained having a thickness of about 1 mm is drawn out of the gap between a pair of chromium plated rolls 1 with an outer diameter of 120 mm and a width of 150 mm heated to temp. exceeding the glass transition temp. of the sheet and less than (m.p. -80 V) thereof to be subjected to stretch processing. A sheet 4 having high elastic modulus, high strength and a good surface state is obtained.

公开(公告)号：JPH11320674A

公开(公告)日：1999-11-24

申请号：JP2797699

申请日：1999-02-04

Applicant: AGENCY IND SCIENCE TECHN

Inventor： NAKAYAMA KAZUO ,  YASUKO KODAMA ,  SAI KON ,  LEON TEBEIK

IPC: C08J5/18 ,  B29C55/04 ,  B29C55/18 ,  B29K67/00 ,  B29L7/00 ,  C08L67/04

Abstract: PROBLEM TO BE SOLVED: To enable imparting of the molecular chain orientation of a polylactic acid by drawing a sheet formed of a polymer blend composition containing the polylactic acid and poly(ε-caprolacton) as main components from a gap between a pair of rolls heated at a specific temperature and giving a specific stretch ratio to the film in the uniaxial direction. SOLUTION: A polymer blend composition sheet 3 obtained by melt-kneading a mixture of polylactic acid(L) and poly(ε-caprolacton(C) obtained by dry- blending beforehand, with the help of a biaxial extruder, is drawn from a gap between a pair of rolls 1 heated at a temperature Ts and the extruded sheet 3 is given a stretch ratio by a factor of 3 or more in the uniaxial direction. The temperature Ts is shown as [Tg(PLLA)×W(PLLA)+ Tm(PCL)-40}×W (PCL)]/100