KR20170138083A - blend - Google Patents

Abstract

Disclosed is a polyester/polycarbonate blend having excellent thermal stability and color stability. Specifically, the polyester/polycarbonate blend comprises: (a) poly(ethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate) (P(ET-CT)) in which 1,4-cyclohexanedimethanol (CHDM) is copolymerized in 40-90 mol% with respect to the total diol components; (b) polyethylene terephthalate; (c) polycarbonate; and (d) 1-100 ppm (weight ratio) of germanium with respect to the total polyester/polycarbonate blend, wherein the contents of the P(ET-CT) and the polyethylene terephthalate are 50-90 wt%; the content of the polyethylene terephthalate is 1-6 folds greater in weight ratio than the P(ET-CT); and the content of the polycarbonate is 10-50 wt%.

Description

A polyester / polycarbonate blend having excellent thermal stability and color stability {blend}

The present invention relates to a polyester / polycarbonate blend, and more particularly to a polyester / polycarbonate blend having excellent thermal stability and color stability.

. Polyesters are excellent in mechanical strength, heat resistance, transparency and gas barrier properties, and therefore, in particular, juices, soft drinks,

It is most suitable as a container for beverage filling such as beverage, packaging film, audio and video film, etc.,

. The sheet or plate of polyester has good transparency and excellent mechanical strength,

Partitions, shop shelves, protective panels, blister packaging, building materials, and interior and exterior materials.

As a new polyester that has recently attracted attention, a thick plastic sheet is molded,

There is an increasing number of cases of use as a molded signboard or the like. However, polyester is another competitive resin used in sheet applications

It has a lower heat resistance than acrylic (PMMA) or polycarbonate (PC)

It may not be suitable for use. Therefore, there have been various technical attempts to improve the heat resistance of the polyester. Among them, a blending technique with PC is a representative method.

Accordingly, an object of the present invention is to provide a polyester / polycarbonate blend excellent in thermal stability and color stability

.

In order to accomplish the above object, the present invention provides a process for the production of (a) 1,4-cyclohexanedimethanol (CHDM)

Poly (ethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate) (P (ET-CT)) (b) Poles

Polyethylene terephthalate; (c) polycarbonate; And (d) for the entire polyester / polycarbonate blend, 1

Wherein the content of P (ETCT) and polyethylene terephthalate is 50 to 90% by weight based on the total polyester / polycarbonate blend, and the content of the polyethylene terephthalate is in the range of 100%

The polyester / polycarbonate blend according to the present invention comprises 1,4-cyclohexane di

Poly (ethylene terephthalate-co-1,4-cyclohexanediol) in which methanol (CHDM) is copolymerized in an amount of 40 to 90 mol%

(Ethylene terephthalate) (P (ET-CT)), polyethylene terephthalate (PET) and polycarbonate (PC)

And has excellent color stability (transparency) and excellent thermal stability (heat resistance) when Color-b (yellow degree) is 4 or less

And it is economical because it contains 1 to 6 times (weight ratio) of polyethylene terephthalate to P (ET-CT), which is relatively expensive to manufacture.

The polyester / polycarbonate blend according to the present invention is characterized in that the thermal stability of the polyester / polycarbonate blend and

(A) 1,4-cyclohexanedimethanol (CHDM) is used as an initiator for improving color stability.

(Ethylene terephthalate-co-1,4-cyclohexylenedimethylene terephthalate) copolymerized with 40 to 90 mol%

Poly (ethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate) (P (ET-CT)

Polyethylene terephthalate (PET), (c) polycarbonate (PC), and (d) germanium.

Claims (1)

(a) poly (ethylene terephthalate) copolymerized with 40 to 90 mol% of 1,4-cyclohexanedimethanol (CHDM)
Oct-co-1,4-cyclohexylenedimethylene terephthalate) (P (ET-CT));
(b) polyethylene terephthalate;
(c) polycarbonate; And
(d) 1 to 100 ppm (by weight) of germanium relative to the total polyester / polycarbonate blend,
For the entire polyester / polycarbonate blend, the content of P (ET-CT) and polyethylene terephthalate was 50
Wherein the content of the polyethylene terephthalate is 1 to 6 times by weight of the P (ET-CT), and the content of the polycarbonate is 10 to 50% by weight based on the P (ET-CT) .