A silicone article, a tube and method of forming an article

A silicone and product technology, applied in the direction of catheter, transportation and packaging, thin material processing, etc., can solve problems such as leaching

Inactive Publication Date: 2016-05-04
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, when the silicone composition is subjected to heat and solvents, leaching of low molecular weight components, i.e. by-products, from the silicone composition can occur

Method used

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  • A silicone article, a tube and method of forming an article
  • A silicone article, a tube and method of forming an article
  • A silicone article, a tube and method of forming an article

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] Using the components seen in Tables 1 and 2 below (amounts expressed in % by weight based on the total weight of the silicone composition), several formulations were mixed and formed into silicone tubes. The silicone matrix component comprises a vinyl-terminated polyalkylsiloxane (ie, indicated as a vinyl-terminated gum having a vinyl content of 0.008% by weight, based on the total weight of the vinyl-terminated gum) , Vinyl-in-chain polyalkylsiloxanes (i.e. indicated as vinyl-in-chain gums having a vinyl content of 0.2% by weight, based on the total weight of the vinyl-in-chain gums ) or a combination thereof. The silicone matrix component has a viscosity greater than 1,000,000 cps. Treated fillers are silica fillers treated with cyclic siloxanes, polydimethylsiloxanes, or combinations thereof. Vinyl terminated silicone polymers are indicated as vinyl blocking fluids with viscosities as indicated. Optional additives include hydride fluids and silicone gums, which ar...

example 2

[0072]Commercial samples were tested in comparison to the silicone composition of Example 1. The matrix is ​​cured with 1 part hydride and 10 ppm platinum and is an industrial and medical grade silicone composition for tubing and moldings. Grades and suppliers are listed below along with turbidity results. Samples indicated as "post-cured" were exposed to heating at 400°F for 2 hours.

[0073] table 3

[0074]

[0075] Clearly, Formulations 1, 2, 3 and 4 of Example 1 had lower turbidity values ​​compared to the commercially available formulations. In particular, Formulations 1, 2, 3, and 4 of Example 1 had turbidity values ​​of less than about 0.3 NTU, while the commercially available formulations had turbidity values ​​of greater than 0.38 NTU. The samples from Dow Corning had the lowest turbidity values ​​at 0.56 NTU and 0.59 NTU, respectively. However, even post curing of the samples from Dow Corning did not provide the same haze values ​​as the current formulations....

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Abstract

The disclosure is directed to a silicone article. The silicone article includes a silicone composition, the silicone composition including a silicone matrix component, a fumed silica filler; and a vinyl-terminated silicone polymer having a viscosity of about 500 centipoise to about 5000 centipoise, wherein the silicone article has a turbidity of less than about 0.3 nephelometric turbidity units (NTU). The disclosure is further directed to a tube and to a method of forming the article.

Description

technical field [0001] In general, the present disclosure relates to silicone articles, tubing, and methods of forming the articles. Background technique [0002] Curable silicone compositions are used in a variety of applications ranging from the automotive industry to medical devices. Typical commercial formulations of silicone compositions include a multicomponent mixture of polydiorganosiloxane, catalyst and filler. Typically, commercial formulations are two-part formulations that are mixed together before use. Once the commercial formulation is mixed, the silicone composition is then molded or extruded and vulcanized. [0003] In many cases, articles formed from silicone compositions are desired for a variety of applications. However, typical commercial formulations may include low molecular weight components. Unfortunately, when the silicone composition is subjected to heat and solvents, leaching of low molecular weight components, ie, by-products, from the silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08K3/36
CPCA61L29/06A61L29/126C08G77/20C08L83/04Y10T428/139C08K3/36C08K9/06
Inventor B·J·沃德R·丁A·朱
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP
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