Patent EP-1008629-A1 (EP)
Inventor: NAKATA KOJI
IPC: C05G3/00
Filed: 1999-05-28
Abstract: The present invention [I] relates to a biodegradable polyester
resin composition comprising an aliphatic polyester resin, a
polycaprolactone, and inorganic additives, in which the ratio of
the aliphatic polyester resin with respect to the polycaprolactone
is 100 parts by weight/1-200 parts by weight and, the ratio of total
amount of the aliphatic polyester resin and the polycaprolactone
with respect to the inorganic additives is 95-50% by weight/5-50%
by weight. 
     The present invention [II] relates to a biodegradable throw-away
glove obtained by T-die molding a polyester resin composition
in which 1-200 parts by weight of a polycaprolactone is mixed with
100 parts by weight of an aliphatic polyester resin to obtain a film
having thickness of 40 µm, and two layers of the film are doubled
up to heat-seal into a glove-shape, and circumferential portions
are cut off. 
     The present invention [III] relates to a biodegradable stake
molded from a polyester resin composition in which 1-200 parts by
weight of a polycaprolactone is mixed with 100 parts by weight of
an aliphatic polyester resin, and which may contain fertilizers
and/or chemicals at an inside portion thereof. 
     The present invention [IV] relates to a protecting material
for plants in which there is molded into a net-like shape a 
polyester resin composition obtained by formulating 1-200 parts by
weight of a polycaprolactone and 5-100 parts by weight of talc with
100 parts by weight of an aliphatic polyester resin, and which is
wound around a trunk of trees, and prevents an injury eaten by
animals. 
     The present invention [V] relates to a biodegradable tape
which comprises molding a lactone resin alone or a lactone-contained
resin composition in which the lactone resin is
formulated with other biodegradable resins and/or additives for
resins, which is excellent in degradability, moldability, and
mechanical properties, and which is employed as a tape for
wrapping-packing and a pressure sensitive adhesive tape, etc. 
     The present invention [VI] relates to a biodegradable card
characterized by employing as a base material a biodegradable resin
composition layer comprising 85-5% by weight of a polylactic acid-based
resin (A), 5-50% by weight of an aliphatic polyester resin
(B), and 10-45% by weight of a polycaprolactone-based resin (C)
(total of the  (A)+(B)+(C)  is 100% by weight) and, further 5-300
parts by weight of fillers (D) based on 100 parts by weight of the
total of the  (A)+(B)+(C) . 
     The present invention [VII] relates to a biodegradable
laminated film obtained by laminating a biodegradable resin layer
with papers, etc., and the biodegradable resin layer is composed of 
an aliphatic polyester resin alone which is a succinic acid-1,4-butanediol
polyester, a succinic acid-ethyleneglycol polyester, or
a succinic acid/adipic acid-1,4-butanediol copolyester, or
composed of the aliphatic polyester resin and the polycaprolactone. 
     The present invention [VIII] relates to a biodegradable
laminated film in which there are laminated at least two different
kinds of biodegradable resin layers, and relates to a biodegradable
film for agriculture. 
     The present invention [IX] relates to a biodegradable multi-layers
film or sheet comprising a layer (A) composed of a
biodegradable aliphatic polyester resin composition which contains
an aliphatic polyester having not relatively high biodegradability
and an aliphatic polyester resin containing a urethane bond,
however, which is more excellent in biodegradability than
themselves, and a layer (B) composed of a lactone resin alone or a
composition of the lactone resin with a biodegradable resin other
than the lactone resin, in which the lactone resin is irradiated
solely or together with at least one of other constructing
components by ionizing radiation. 
     The present invention [X] is to a biodegradable thin film
having a film thickness of 5-25 µm, and which comprises a
composition of an aliphatic polyester resin having a specified melt
flow rate and melt tension with a polycaprolactone.  
     The present invention [XI] relates a cushion sheet having
great many of discontinuous cells, in which there is employed a
biodegradable shrink film including a polycaprolactone irradiated
by an ionizing radiation. 
     The present invention [XII] relates to particle-state
products on which there is coated a polycaprolactone irradiated by
an ionizing radiation and, particularly, it relates to a coated
fertilizer, coated agricultural chemicals, or microcapsule for
carbonless copy paper which have a biodegradable thin layer and an
excellent storage stability. 
     The present invention [XIII] relates to particle-state
fertilizers on which there is coated a biodegradable coating layer
including a biodegradable polylactone. 
     The present invention [XIV] relates to a biodisintegrable
resin composition which comprises a lactone resin having a
specified composition, an aliphatic polyester resin, a fatty acid
amide, and a thermoplastic resin having a high impact strength and,
further, optionally, in which there are added a liquid lubricant,
finely-powdered silica, and talc.