Raychem Limited

3l & T, Inc.

Linas Mazeika

Rong Jong Chang

Ryan W Dupon

Erling Hansen

Karin M Kinsman

Amy S Chu

Martha L McCrum

Matt Spalding

John A Midgley

William L Betts, Iii

Edita Rojasova

Overall, ebonite coatings or elastomeric linings are not recommended for direct immersion in sulfuric acid with higher than 65% concentration. By blending a chemical resistant epoxy resin to an ebonite coating, the resulting epoxy ebonite composition can be employed in more severe environment such as direct immersion in &#x3e;65% sulfuric acid. In particular, the present invention provides a blend of an epoxy coating with an ebonite coating with a mix ratio of 95/5 to 5/95, the resulting epoxy ebonite composition of which has greatly increased adhesion to steel and excellent resistance to undercut corrosion when subjected to salt spray. The epoxy ebonite composition according to the present invention can be used as coatings, adhesives, encapsulants or sealants and is particularly useful as industrial coatings that are subject to wide temperature variations, salt contamination or chemical attack.

Epoxy ebonite compositions

A liquid ebonite mixture for coating includes two reactive components. The first component contains first unsaturated polymers having first functional groups capable of reaction at ambient condition either with or without a catalyst, a vulcanization agent, and a vulcanization activator. The second component contains second unsaturated polymers having second functional groups that will react with the first functional groups at ambient temperature. The first and the second unsaturated polymers must contain sufficient unsaturated backbones to allow vulcanization with the vulcanization agent. In addition, the second unsaturated polymers must be thermodynamically compatible with the first unsaturated polymers so that macroscopic phase separation will not occur and the vulcanization can happen homogeneously through out the coating. The first and second components further include first and second viscosity reducers, which have viscosity lower than the first and the second unsaturated polymers, for adjusting the viscosity of the liquid ebonite mixture. Furthermore, a thixotropic agent, a reinforcing agent, a vulcanization activator, a vulcanization accelerator, a solubilizer for vulcanization agent, and a catalyst also can be added into the mixture. Liquid ebonite mixture of the present invention is sprayable, and a coating formed by this liquid ebonite mixture sets up quickly without sagging and has low tackiness that allows easy handling and inspection.

Quick set ebonite composition

The invention provides for a method of molding an elastomeric material which avoids longitudinal mold lines and an improved molding composition as well as molded parts for hybrid insulators and the like.

Molding methods, track resistant silicone elastomer compositions and

Molding methods, track resistant silicone elastomer compositions, and

A tracking and erosion resistant composition includes (a) 100 parts by weight of organopolysiloxane; (b) between 1 and 15 parts by weight of magnesium oxide; (c) between 15 and 45 parts by weight of zinc oxide and (d) between 5 and 40 parts by weight of iron oxide.

Tracking and erosion resistant composition

A method for making a high strength porcelain for use as an insulator or a structural ceramic, comprising: A) forming a mixture comprising alumina, clay and a fluxing material; B) forming the mixture into a shaped article; and C) firing the shaped article.

High strength porcelain and method therefor

A porcelain having 9 to 55% by weight of SiO.sub.2, 36 to 87% by weight of Al.sub.2 O.sub.3, 0 to 2.0% by weight of Fe.sub.2 O.sub.3, 0 to 1.0% by weight of TiO.sub.2, 0 to 0.5% by weight of CaO, 0 to 0.5% by weight of MgO, 1.0 to 4.0% by weight of K.sub.2 O and Na.sub.2 O combined, and 0.25 to 25.0% by weight of bismuth oxide is disclosed. The porcelain has unexpectedly high unglazed bending strength and may be used for dielectric and structural applications.

An insulator member comprises a porcelain insulator head and a polymeric shed secured to the insulator head. The insulator member can be used, for example, in an improved electrical line insulator which comprises a) an insulator unit comprising a porcelain head, and a polymeric shed secured to the porcelain head; b) a metal cap and a metal pin each situated at a surface of the insulator unit opposite to the other, the porcelain head forming a recess to receive the pin; c) cement mechanically securing the cap to the insulator unit; and d) cement within the recess and about the pin mechanically securing the pin within the recess. Methods of manufacture are also disclosed.

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San Carlos, CA, United States of America

Linas Mazeika