Ire Chemical Ltd.

Lg Display Co., Ltd.

Hyun Soo Chung

Dong Hoon Kim

Jae Wang Lee

Chi Young Lee

Hye Cho Shin

Duck Su Oh

Sung Tae Lee

Do Youn Kim

Jeong Ho Son

Ah Ra Cho

Suok Woo Lee

Ho Geol Lim

Sock Woo Lee

Jung Nam Jun

Lamp with sound

Lamp with sound organic light emitting diode (OLED) coupled thereto

The present invention provides a copolyester resin composition which has good physical properties, biodegradability and processability and a process for preparing and/or producing the same. To improve the biodegradability and physical properties of the copolyester, the present invention applied multi-stage reaction step, and copolyester resin having number average molecular weight of from 30,000 to 70,000, weight average molecular weight of from 100,000 to 600,000, melting point of from 55&deg; C. to 120&deg; C., and melt index of from 0.1 to 30 g/10 minute (190&deg; C., 2,160 g) is obtained. The processability and physical properties of the copolyester resin of the present invention has been greatly enhanced by incorporating (i) an &ldquo;aromatic-aliphatic prepolymers&rdquo; having number average molecular weight of from 300 to 30,000 and the contiguous repeating unit of aromatic group in the dicarboxylic acid position of &ldquo;aromatic-aliphatic prepolymers&rdquo; is less than 5. Thus it can be processed by using the conventional processing equipment for polyethylene and polypropylene without any modification.

Copolyester resin composition and a process of preparation thereof

An aromatic group containing copolyester resin composition which has good biodegradability and physical properties, wherein; (i) 0.1 wt % to 30 wt % of an aliphatic prepolymers having number average molecular weight of from 300 to 30,000; (ii) one or a plurality of aromatic dicarboxylic acid (or an acid anhydride thereof which containing aromatic group in the molecule; (iii) one or a plurality of aliphatic (including cyclic type) dicarboxylic acid (or an acid anhydride thereof); and (iv) one or a plurality of aliphatic (including cyclic type) glycol, wherein the copolyester resin has number average molecular weight of from 30,000 to 90,000, weight average molecular weight of from 100,000 to 600,000, melting point of from 70&deg; C. to 150&deg; C., and melt index of from 0.1 to 50 g/10min. (190&deg; C., 2,160 g), and the process for preparing and/or producing the same. The composition and preparation method provides a high molecular weight copolyester resin which has good biodegradability and physical properties required for packaging film, trash bags and agricultural film.

A golf tee on which a golf ball is positioned. The golf tee,has a head,having a golf ball positioning portion,A shaft,is connected to the head. The shaft,is tapered from the head,towards one end thereof and has a quadrangular cross-section. A recessed portion,is formed in the golf ball positioning portion,of the head portion. The central line,of the recessed portion is substantially identical with the central line of the quadrangular surface of the shaft.

Golf tee

The present invention relates to a high molecular weighted biodegradable polyester resin which can be used in medical, agricultural and fishery packaging materials by enhancing the low heat-resistance of the general aliphatic polyester and the preparing method for them. The present invention provides a polyester resin which is prepared by condense-polymerization after one or a plurality of condensation, esterification and ester-exchange reaction with main ingredients of (1) an aliphatic (including circular aliphatic) dicarboxylic acid (or an acid anhydride thereof) including an adipic acid, (2) an aliphatic (including circular aliphatic) glycol at least selected from one of 1,4-butanediol and ethyleneglycol with a little of a monomer including one or a plurality of an amine radical from 0.1 to 30% by weight which is about theoretical polyester weight acting as a functional radical, wherein the polyester resin has a number average molecular weight of 30,000 to 70,000, a weight average molecular weight from 160,000 to 600,000, a melting point from 45.degree. C. to 60.degree. C. and a melt flow index from 0.1 to 50 g/10 min(190.degree. C., 2,160 g) and the process for preparing and/or producing the same.

Polyester resin and a process for preparing the same

Growing community of inventors

Seoul, South Korea

Hyun Soo Chung