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Coagent-mediated, grafted copolymers and preparation methods

A technology of graft copolymer and coagent, which is applied in the field of copolymer grafting, can solve problems such as narrow range, inability to prepare polymer blends, polymer immiscibility, etc., and achieve improved transparency, good strain hardening characteristics, Effect of High Melt Strength

Inactive Publication Date: 2008-12-17
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in many cases the desired polymer blends cannot be prepared because (i) the polymers are immiscible or incompatible, (ii) the polymer blends exhibit only a narrow range of properties, or (iii) if the dispersion limitations of certain polymers are not carefully controlled, deleterious effects will occur

Method used

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  • Coagent-mediated, grafted copolymers and preparation methods
  • Coagent-mediated, grafted copolymers and preparation methods
  • Coagent-mediated, grafted copolymers and preparation methods

Examples

Experimental program
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Embodiment 1

[0049] Graft copolymers were prepared from homopolymer (isotactic) polypropylene with a number average molecular weight of 1700 and polyethylene via peroxide-initiated co-grafting of trimellitate triallyl (TATM). The polypropylene was experimental reactor isotropic homopolymer polypropylene powder (PP) manufactured by the Dow Chemical Company. The properties of the resin were as follows: a melt flow rate (MFR) of 3.14 g / 10 minutes; a DSC melting point of 167.1° C.; a bulk density of 0.47 g / cm 3 .

[0050] PP (1 g), PE (1 g) and trichlorobenzene (20 mL) were heated to 150° C. in an oil bath to form a clear solution. TATM (0.06 g, 3 wt%) and dicumyl peroxide (DCP) (0.002 g, 0.1 wt%) were added and the mixture was maintained at 150°C for 60 minutes. The polymerization product was recovered by precipitation from acetone (50 mL), and the resulting sample was dried under vacuum.

[0051] To isolate the reaction product, the dried polymer was stirred in xylene (25 ml) at 140°C to p...

Embodiment 2

[0055] As previously mentioned, the preparation of coagent-mediated graft copolymers depends on the relative free radical reactivity of the organic polymer, especially for the incorporation of allyl groups. The reactivity of the four desired materials has been evaluated by a series of peroxide-mediated addition reactions of allyl benzoate (AB). Isotactic polypropylene homopolymer and polyethylene (PE, Mn = 1,700, Sigma-Aldrich) were purified by dissolution / precipitation (xylene / acetone) before use. Polyethylene oxide (PEO, Mn=5000, Alfa-Aeser) and ethylene-vinyl acetate copolymer (EVA, 25 wt% VA, Scientific Polymers Products) were purified by dissolution / precipitation (trichlorobenzene / acetone). Allyl benzoate (AB, 99%, TCI) and dicumyl peroxide (DCP, 98%, Sigma-Aldrich) were used directly.

[0056]AB was grafted onto each polymer as follows. The desired polymer (1 g) was dissolved in trichlorobenzene (20 ml) at 150°C. Allyl benzoate (0.05 g) and the required amount of dicu...

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Abstract

The present invention yields a coagent-mediated, grafted copolymer prepared from a free radical-mediated reaction of a mixture containing or made from (a) a first free-radical reactive organic polymer, (b) a second free-radical reactive organic polymer, and (c) a coagent selected from the group consisting of allyl, vinyl, and acrylate coagents, wherein the first and second organic polymers are chemically dissimilar polymers as determined by at least one physical property yet the organic polymers have similar reactivity in radical-mediated additions to the coagent.

Description

technical field [0001] The present invention relates to copolymer grafting. In particular, the present invention relates to the free radical initiated grafting of at least two polymers together via an allyl, vinyl or acrylate coagent. Background technique [0002] Polymer composites and blends are used in a wide variety of applications. Polyolefin and polystyrene composites and blends are of particular commercial interest. Notable polyolefins are polyethylene, polypropylene, ethylene / propylene rubber and polyisobutylene. [0003] Polymer blends are particularly desirable because the processing characteristics of polymer blends or finished products thereof take advantage of the blend's balanced properties. However, in many cases the desired polymer blends cannot be prepared because (i) the polymers are immiscible or incompatible, (ii) the polymer blends exhibit only a narrow range of properties, Or (iii) if the dispersion limitation of certain polymers is not carefully co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/00C08F255/00C08F255/02C08L51/00
CPCC08F255/00C08F255/02C08F287/00C08F291/00C08L51/003C08L51/006C08L51/04C08L51/06C08L2666/02C08L51/00
Inventor J·S·帕伦特S·S·森古普塔B·I·乔达里M·F·芬利森S·F·哈恩G·A·古铁雷斯
Owner DOW GLOBAL TECH LLC
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