Julv 1990 Additives for Poivmers

US 4,895,992 LIGHT STABILIZER Du Pont 82 Co. Priority Date: 28 July, 1988.

Hindered tertiary amine aminoalkyl rne~a~la~ stabilizer for spandex.

US 4,897,436

us 4,897,469

STABILIZERS Bayer AG Priority Date: 22 January, 1987.

Reaction products of diphenylamines and phenothiazines as stabilizers for nylons and rubber materials.

CURING AGENT FOR EPOXY RESINS Ajinomoto Co. Inc. priority Date: 28 January, 1987.

Mixture of a substituted urea and a dicarboxylic acid.

PRODUCT I~OR~TION

Spheriglass solid glass spheres

potters Industries Inc. has issued a new technical notation bulletin for its Spheriglass high performance solid glass polymer additives that includes new data on size, bulk density and oil absorption. The new literature provides updated data, illustrations of how glass spheres work in polymer applications and a comparison of the properties of Potters’ A-Glass (soda- lime) and E-Glass (bore-silicate) spheres.

Smooth glass spheres offer high loading capacity with the lowest surface to volume ratio to reduce costs by displacing expensive resins. In addition, Spheriglass additives control shrinkage and warpage, increase abrasion resistance and surface hardness and improve stress distribution in moulded polymers. The shape and moulding characteristics of glass spheres allow them to wet and disperse easily, minimize viscosity increases of the liquid resin and reduce defects due to poor flow.

The new Spheriglass Bulletin reviews performance benefits and provides general product notation. A discussion of tensions stability is ~~~a~d with laboratory photos showing the stress patterns surrounding different particle shapes. A section on Coupling Agent Coatings includes typical performance data and recommended coupling agents for 26 different resin systems,

01990 Elsevier Science Publishers Ltd. 15

Additives for Polymers JW 1990

(Potters Industries Inc., is an affiliate of the PQ Corporation).

To obtain a copy of this new information brochure, contact:

Customer Service Group of Potters Industries Inc., Polymer Additives Division, 20 Waterview Boulevard, Parsippany, NJ 07054, USA.

Fax: (201) 335-9350 Tel: (201) 299-2900

New modifier for PVC Monsanto Europe has introduced a new grade within its range of Elix modifiers for PVC compounds. Elix 3610 opens up application possibilities for products which demand elevated levels of heat stability and transparency. One of the major potentials for this new modifier is seen to be in packaging. With this new product, Monsanto believe they have the means for PVC to penetrate a number of major markets; for example PVC modified in this fashion can withstand such hot-fill processes as jam or honey filling. Beyond this, the material can withstand the extreme conditions which may be encountered with products such as soup, where the cycle runs from hot-fill, to freezer, to microwave.

In such applications, Elix 3610 makes it possible for PVC to compete with other materials. Aluminium packaging is currently widely used, but cannot be used in a microwave and does not offer transparency - an important marketing consideration for many producers. Polycarbonates do offer such properties, but at approximately twice the cost of Elix modified compounds of PVC.

Chemically, Elix 3610 is described as a &polymer modifier, based on styrene and maleic anhydride. Importantly for the likely range of applications, the material fully conforms to all existing EEC food contact regulations. In a typical PVC (K50y Elix 361QMES blend, samples of 0.4 mm thickness demonstrated light transmission values in the range 85-90% with hazing of only 4%. Heat resistance performance is also impressive. During development, cups moulded in compounds of transparent PVC were subjected to a temperature of 1 10°C for 30 minutes. Those incorporating Elix 3610 showed no sign of deformation, while those modified with an alternative heat resistant material became completely misshapen. Expressing the very high heat properi,ies anoti~ef way, the addition of 20-O/o Elix 3610 to a PVC compound can increase performance in the order of +30(X.

Unlike other products in Monsanto’s Elix 300 series, Elix 3610 is not specifically impact modified. In most applications, the

16 01990 Elsevier Science Publishers Ltd.