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Polydiorganosiloxane polyoxamide copolymers

A copolymer, alkyl technology, applied in synthetic resin layered products, metal material coating process, vacuum evaporation plating and other directions

Active Publication Date: 2009-01-14
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such block copolymers have many desirable properties, some of them tend to degrade when subjected to high temperatures such as 250°C or higher

Method used

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  • Polydiorganosiloxane polyoxamide copolymers
  • Polydiorganosiloxane polyoxamide copolymers
  • Polydiorganosiloxane polyoxamide copolymers

Examples

Experimental program
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Effect test

example 1

[0136] The precursor prepared in Preparative Example 1 (793.20 grams) was added to a 3 liter 3 neck resin flask equipped with a mechanical stirrer, heating mantle, nitrogen inlet tube (with stopcock) and outlet tube. The flask was purged with nitrogen for 15 minutes, and hexamethylenediamine (17.48 grams) was added. The mixture was stirred mechanically and heated to 150° C. for 3.5 hours under nitrogen atmosphere. The viscous molten product was poured into a glass dish and allowed to cool. The resulting polydimethylsiloxane-polyoxamide was a transparent elastomeric sheet with a Shore A hardness of 59.

[0137] Color, haze and light transmission were measured on 24 micron thick melt-pressed samples. For wavelengths between 400nm and 700nm, the light transmission exceeds 91%. The C2* percent haze value is 1.7% and the A2* percent haze value is 1.6%. The L*, a*, and b* values ​​were 97.15, 0.03, and 0.52, respectively.

example 2

[0139] The precursor prepared in Preparative Example 1 (100.00 grams) was added to a 16 oz. jar. EDA (1.0243 g) was added. Seal the jar tightly and stir the mixture briskly until the contents become too thick to flow. After stirring overnight at ambient temperature, the solid product was dissolved in THF (200 g). Films were cast by pouring the solutions into petri dishes and then allowing the THF to slowly evaporate overnight at ambient temperature. The resulting polydimethylsiloxane-polyoxamide was a transparent elastomeric film with a Shore A hardness of 55.

example 3

[0141] The precursor prepared in Preparative Example 1 (100.00 grams) was added to a 16 oz. jar. An aliquot of BDA (1.5025 g) was added. Seal the jar tightly and stir the mixture briskly until the contents become too thick to flow. The jars were placed on an open mill overnight at ambient temperature. The solid product was dissolved in THF (200 g). Films were cast by pouring the solutions into petri dishes and then allowing the THF to slowly evaporate overnight at ambient temperature. The resulting polydimethylsiloxane-polyoxamide was a transparent elastomeric film with a Shore A hardness of 54.

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Abstract

Polydiorganosiloxane polyoxamide, linear, block copolymers and methods of making the copolymers are provided. The method of making the copolymers involves reacting a diamine with a precursor having at least one polydiorganosiloxane segment and at least two oxalyamino groups. The polydiorganosiloxane polyoxamide block copolymers are of the (AB)n type.

Description

technical field [0001] Polydiorganosiloxane-polyoxamide copolymers and methods of making the copolymers are described. Background technique [0002] Silicone polymers have a number of unique properties derived primarily from the physical and chemical properties of the siloxane bond. Such properties include low glass transition temperature, thermal and oxidative stability, resistance to ultraviolet radiation, low surface energy and hydrophobicity, high permeability to various gases, and biocompatibility. However, silicone polymers generally lack some tensile strength. [0003] The low tensile strength of silicone polymers can be improved by forming block copolymers. Some block copolymers contain one "soft" silicone polymer block or segment, and optionally as many "hard" blocks or segments. Polydiorganosiloxane-polyamides and polydiorganosiloxane-polyureas are exemplary block copolymers. [0004] Polydiorganosiloxane-polyamides can be prepared by the condensation reaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/455C08G77/38C08G77/00C08G73/10
CPCB32B27/283C08L83/14C08G69/00C23C14/12C08G77/455B32B7/12Y10S526/935C08G77/388C08G77/54B29C45/0001B32B3/00Y10T428/2982Y10T428/24479Y10T428/1397Y10T428/31663C08L83/10C08G77/38C08G77/00C08G73/10
Inventor 查尔斯·M·利尔卡尔·E·本森理查德·G·汉森马克·D·普格特艾伯特·I·埃费拉茨奥德蕾·A·舍曼
Owner 3M INNOVATIVE PROPERTIES CO
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