Method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a polyethylene terephthalate-based block copolymer polyester
First Claim
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1. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:
- melting at a temperature of 250°
C. or above a mixture “
A”
comprising;
(1) 100 parts by weight of a polyethylene terephthalate (PET)-based polyester “
a”
having a melt flow rate (MFR, JIS method;
280°
C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;
(2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “
b”
as an auxiliary material;
(3) 2 to 20 parts by weight of a polyester elastomer “
c”
as another auxiliary material;
(4) 0.1 to 2 parts by weight of a mixture “
f”
containing a compound “
d”
having two epoxy groups and a compound “
e”
having three or more epoxy groups in a weight ratio of (95 to
40)/(5 to
60) as a binder; and
(5) 0.05 to 1 part by weight of an organic acid metal salt “
g”
as a catalyst;
turning the mixture “
A”
into block copolymer pellets by subjecting it to a uniform reaction under deaeration and dehydration in vacuum;
molding a mixture comprising 100 to 10 parts by weight of the block copolymer pellets and 0 to 90 parts by weight of PET “
B”
having an intrinsic viscosity of 0.60 to 0.80 dL/g into an unoriented film through a casting method; and
extending the unoriented film into an oriented film through a biaxial orientation method.
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Accused Products
Abstract
A PET-based polyester packaging film capable of weld-cut sealing and heat-shrinkage refers to a film obtained by biaxially orienting a material prepared through block copolymerization of a PET/PETG/polyester elastomer with an epoxy resin and a catalyst. This film eliminates the most serious weak points in physical properties of conventional PET films, and is useful for packaging of books, bottlesets, food containers, etc., for general packaging, packaging of industrial materials, and the like, and is further useful in the field of packing and packaging of daily commodities, civil engineering and construction members, electric and electronic members, and automobile vehicle members, etc. Moreover, this film can be produced through effective use of the huge amount of recycled PET bottles and inexpensive PET for fiber as a prepolymer, and thus is also highly beneficial socially. Still further, even if incinerated after use, this film produces a combustion heat value lower than that of a polyethylene or polypropylene. Thus, this film barely damages incinerators or the like, and emits no toxic gases.
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Citations
11 Claims
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1. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:
-
melting at a temperature of 250°
C. or above a mixture “
A”
comprising;
(1) 100 parts by weight of a polyethylene terephthalate (PET)-based polyester “
a”
having a melt flow rate (MFR, JIS method;
280°
C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;
(2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “
b”
as an auxiliary material;
(3) 2 to 20 parts by weight of a polyester elastomer “
c”
as another auxiliary material;
(4) 0.1 to 2 parts by weight of a mixture “
f”
containing a compound “
d”
having two epoxy groups and a compound “
e”
having three or more epoxy groups in a weight ratio of (95 to
40)/(5 to
60) as a binder; and
(5) 0.05 to 1 part by weight of an organic acid metal salt “
g”
as a catalyst;
turning the mixture “
A”
into block copolymer pellets by subjecting it to a uniform reaction under deaeration and dehydration in vacuum;
molding a mixture comprising 100 to 10 parts by weight of the block copolymer pellets and 0 to 90 parts by weight of PET “
B”
having an intrinsic viscosity of 0.60 to 0.80 dL/g into an unoriented film through a casting method; and
extending the unoriented film into an oriented film through a biaxial orientation method. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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2. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:
-
melting at a temperature of 250°
C. or above a mixture “
A”
comprising;
(1) 100 parts by weight of a PET-based polyester “
a”
having an MFR (JIS method;
280°
C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;
(2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “
b”
as an auxiliary material;
(3) 2 to 20 parts by weight of a polyester elastomer “
c”
as another auxiliary material;
(4) 0.1 to 2 parts by weight of a mixture “
f”
containing a compound “
d”
having two epoxy groups and a compound “
e”
having three or more epoxy groups in a weight ratio of (95 to
40)/(5 to
60) as a binder; and
(5) 0.05 to 1 part by weight of an organic acid metal salt “
g”
as a catalyst;
turning the mixture “
A”
into block copolymer by subjecting it to a uniform reaction under deaeration and dehydration in vacuum;
molding the obtained block copolymer into an unoriented film through a casting method; and
extending the unoriented film into an oriented film through a biaxial orientation method.
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3. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:
-
melting at a temperature of 250°
C. or above a mixture “
A”
comprising;
(1) 100 parts by weight of a PET-based polyester “
a”
having an MFR (JIS method;
280°
C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;
(2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “
b”
as an auxiliary material;
(3) 2 to 20 parts by weight of a polyester elastomer “
c”
as another auxiliary material;
(4) 0.1 to 2 parts by weight of a mixture “
f”
containing a compound “
d”
having two epoxy groups and a compound “
e”
having three or more epoxy groups in a weight ratio of (95 to
40)/(5 to
60) as a binder; and
(5) 0.05 to 1 part by weight of an organic acid metal salt “
g”
as a catalyst;
turning the mixture “
A”
into block copolymer by subjecting it to a uniform reaction under deaeration and dehydration in vacuum;
extruding the block copolymer into a cast film;
while continuously extending the cast film into an oriented film through a biaxial orientation method.
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11. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:
-
melting at a temperature of 250°
C. or above a mixture A′
comprising;
(1) 100 parts by weight of a PET-based polyester “
a”
having an MFR (JIS method;
280°
C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;
(2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “
b”
as an auxiliary material;
(3) 2 to 20 parts by weight of a polyester elastomer “
c”
as another auxiliary material;
(4) 1 to 15 parts by weight of a binder masterbatch “
i”
comprising 100 to 50 parts by weight of a mixture “
f”
containing a compound “
d”
having two epoxy groups and a compound “
e”
having three or more epoxy groups in a weight ratio of (95 to
40)/(5 to
60), and 100 parts by weight of a base substance “
h”
as a binder; and
(5) 0.5 to 5 parts by weight of a catalyst masterbatch “
k”
containing 5 to 15 parts by weight of an organic acid metal salt “
g” and
100 parts by weight of a base substance “
j”
as a catalyst;
turning the mixture A′
into a block copolymer by subjecting it to a uniform reaction under deaeration and dehydration in vacuum; and
molding the obtained block copolymer into an oriented film through a biaxial orientation method or a tubular method.
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Specification
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Current AssigneeNakamoto Packs Co.,Ltd.
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Original AssigneeNakamoto Packs Co.,Ltd.
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InventorsNakamoto, Takashi, Kobayashi, Yukio, Fujimaki, Takashi, Shibano, Hiroshi
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Application NumberUS10/572,674Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current264/210.700CPC Class CodesB29B 9/06 in the form of filamentary ...B29B 9/12 characterised by structure ...C08G 59/42 Polycarboxylic acids; Anhyd...
