Method for the preparation of polydimethylsiloxanes having low reactivity endgroups and high reactivity endgroups and polydimethylsiloxanes made thereby

A polydimethylsiloxane which has both low reactivity endgroups and high reactivity endgroups. These polydimethylsiloxanes are useful for making sealants with reduced modulus. An example of these polydimethylsiloxanes is one having low reactivity endgroups of the formula ZR2SiO- where Z is alkoxy, ac...

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Bibliographic Details
Main Author ALTES; MICHAEL G
Format Patent
LanguageEnglish
Published 13.12.1994
Edition5
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:A polydimethylsiloxane which has both low reactivity endgroups and high reactivity endgroups. These polydimethylsiloxanes are useful for making sealants with reduced modulus. An example of these polydimethylsiloxanes is one having low reactivity endgroups of the formula ZR2SiO- where Z is alkoxy, acyloxy, or N-methylbenzamido, and R is methyl or vinyl and high reactivity endgroups having a formula Y'hYbR''(3-b-h)SiO- in which b is 1, 2, or 3, h is 0 or 1, b+h is 2 or 3, R'' is a monovalent hydrocarbon radical, and each Y is an acyloxy groups or N-methylbenzamido, and Y' is an alkoxy groups.
Bibliography:Application Number: US19930139358