Expandable thermoplastic polyurethane comprising blowing agent, wherein the Shore hardness of the thermoplastic polyurethane is from A 44 to A 84.

Expandable thermoplastic polyurethane comprising blowing agent, wherein the Shore hardness of the thermoplastic polyurethane is from A 44 to A 84.

Expandable thermoplastic polyurethane comprising blowing agent, wherein the Shore hardness of the thermoplastic polyurethane is from A 44 to A 84.

The present invention provides a process for extruding and pelletising a propylene copolymer. The copolymer has a content of comonomer from 5 to 40% by mole, a melt flow rate MFR.sub.2 measured at 230° C. under a load of 2.16 kg of from 0.5 to 15 g/10 min and a content of cold xylene soluble material of from 20 to 60% by weight. The process comprises extruding the propylene copolymer through a die plate into an underwater pelletiser and cutting strands of the propylene copolymer into pellets in the underwater pelletiser, wherein the ratio of the mass flow rate of the propylene copolymer to the mass flow rate of the cooling water is from 0.020 to 0.060; and the propylene copolymer comprises a polymeric nucleating agent.

A device for producing dyed plastic granulate and undyed plastic granulate includes a multi-shaft screw extruder and an underwater pelletizing installation. A granulate changeover unit which separates the dyed plastic granulate from the undyed plastic granulate is disposed in a conveying direction downstream of the underwater pelletizing installation. The dyed plastic granulate is separated from the pelletizing water via a first separator installation, and the undyed plastic granulate is separated from the pelletizing water via a second separator installation. The separator installations are disposed so as to be mutually parallel. The device enables a simple, flexible and economical selective production of the dyed plastic granulate and the undyed plastic granulate.

A process for preparing a TPU alloy material through in-situ compatibilization includes: 1) adding a premixed TPU raw material to a feeding port of a twin-screw extruder; injecting a mixture of an alloy component and a dual-active substance into the twin-screw extruder through a lateral feeding port; adding an auxiliary reagent to the TPU raw material or the mixture of the alloy component and the dual-active substance, wherein the alloy component is a polyolefin or a thermoplastic polymer material having reactivity, wherein the dual-active substance is a substance containing a group reactive with the TPU raw material and a group reactive with the alloy component, and the auxiliary reagent includes an initiator; 2) controlling a temperature of a reaction zone of the twin-screw extruder at 50° C. to 250° C., and granulating an extruded material by underwater cutting; and 3) drying the granulated product to obtain the TPU alloy material.

Ethylene-vinyl alcohol copolymer pellets comprise an ethylene-vinyl alcohol copolymer and water, and have a water content of not higher than 0.5 wt. %, wherein the ratio (Y/Z) of a lactone ring content (Y) to the sum (Z) of a carboxylic acid content (X) and the lactone ring content (Y) in terminal structures of the ethylene-vinyl alcohol copolymer is not less than 60 mol %. The pellets are excellent in high-temperature thermal decomposition-suppressing effect and thermal stability, and are free from odor emanation and coloration even if being processed at a higher temperature.

Foam pellets comprising a thermoplastic vulcanizate (TPV) and thermo-expandable microspheres, the foam pellet having a specific gravity of 0.2 to 1.0 and the TPV being composed of an at least partially vulcanized rubber component and a thermoplastic component. The foam pellets may be subsequently processed to form various foam articles without the need to include a foaming agent during processing.

A process for recycling polyolefins comprising the steps of extruding used polyolefin material, producing granules from the polyolefin material exiting from the extrusion into a liquid cooling medium, separating the cooling medium to obtain a dry polyolefin granulate, and treating the dry polyolefin granulate in a treatment space with a treatment gas, preferably by counter-current flow, immediately after separation of the cooling medium, the dry polyolefin granules still have a granule temperature (T2) which is above a temperature (T1) of the liquid cooling medium and in the range of 71° C.-200° C., preferably 80° C.-160° C., but below the melting point of the granules, and at least 75% of the dry polyolefin granules, in the treatment space, have a dry temperature (T3) which is in the range of granule temperature (T2)±20° C., but below the melting point of the granules.

Problem to be solved: To provide an ethylene-vinyl alcohol copolymer composition which is excellent in impact resistance even without a resin other than an ethylene-vinyl alcohol copolymer blended therein. Solution to the problem: Use an ethylene-vinyl alcohol copolymer resin composition contains: (A) an ethylene-vinyl alcohol copolymer; (B) an aliphatic carboxylic acid metal salt; and (C) a sorbic acid ester; wherein the aliphatic carboxylic acid metal salt (B) contains a metal moiety selected from the group consisting of long Periodic Table 10.sup.th to 12.sup.th element metals; wherein the sorbic acid ester (C) is present in an amount of 0.0001 to 10 ppm based on the total amount of the ethylene-vinyl alcohol copolymer (A), the aliphatic carboxylic acid metal salt (B), and the sorbic acid ester (C).