Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From boron reactant having at least one boron to hydrogen or...
Reexamination Certificate
2002-09-26
2004-08-31
Robertson, Jeffrey B. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From boron reactant having at least one boron to hydrogen or...
C528S030000, C528S032000
Reexamination Certificate
active
06784270
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to polymers containing borate groups, alkynyl groups, at least one silyl group and/or at least one siloxyl group.
2. Description of the Related Technology
Thermally stable polymeric elastomers consisting of alternating carborane and siloxane groups are known for both the deca- and penta-carboranes (HCB
10
H
10
CH and HCB
5
H
5
CH respectively). See, for example, U.S. Pat. No. 3,463,801. Some have been produced commercially. However, these materials do not contain alkynyl moieties such as acetylenic groups or any other functional group for crosslinking to produce thermosetting polymers. These poly(carborane-siloxane) elastomers show superior thermal (high chars) and oxidative properties (low weight loss) at elevated temperatures (900° C.) as compared to analogous poly(siloxanes) as monitored by thermogravimetric analysis (TGA).
Silylene or siloxane-acetylene and silylene or siloxane-diacetylene polymers have also been reported. See, for example, U.S. Pat. No. 5,483,017. Good quality fibers can be drawn from the melts of the silylene polymers either thermally or with UV light, but they lack the thermally and oxidatively stable boron-containing units.
Linear inorganic-organic polymers containing acetylenic and either bis(silyl or siloxyl)carboranyl units or a random distribution of both bis(silyl or siloxyl)carboranyl and bis(silyl or siloxy) units have also been described. See, for example, U.S. Pat. No. 5,272,237. However, these polymers contain carborane units in each repeating unit which result in a limited availability and high cost.
Accordingly, it is an objective of certain embodiments of the present invention to provide a polymer having improved thermal stability by incorporating boron into its backbone.
It is another objective of certain embodiments of the present invention to provide a cross-linkable boron-containing polymer.
It is another objective of certain embodiments of the present invention to provide a low cost boron-containing polymer useful for making high-temperature, oxidatively stable thermosets or ceramics.
SUMMARY OF THE INVENTION
In a first aspect, the present invention provides a polymer produced by reacting a first compound having at least one alkynyl group, at least one silyl group and/or at least one siloxyl group with a second compound selected from boric acid, hydrocarbon boronic acid, hydrocarbon borate, boron oxide, and pyroboric acid.
In a second aspect, the present invention provides a method of preparing an organoboron polymer including the step of reacting a first compound having at least one alkynyl group, at least one silyl group and/or at least one siloxyl group with a second compound selected from boric acid, hydrocarbon boronic acid, hydrocarbon borate, boron oxide, and pyroboric acid.
In a third aspect, the present,invention provides a polymer having a repeating unit including, at least one alkynyl group, at least one borate group, at least one silyl group and/or at least one siloxyl group.
REFERENCES:
patent: 2431878 (1947-12-01), McGregor et al
patent: 2541851 (1951-02-01), Wright
patent: 3463801 (1969-08-01), Pepetti et al.
patent: 3933712 (1976-01-01), Vanaglash, Jr.
patent: 4139547 (1979-02-01), Berger
patent: 4152509 (1979-05-01), Yajima et al.
patent: 4395527 (1983-07-01), Berger
patent: 4480009 (1984-10-01), Berger
patent: 4499149 (1985-02-01), Berger
patent: 4847154 (1989-07-01), Ryang
patent: 4851491 (1989-07-01), Riccitiello et al.
patent: 4940767 (1990-07-01), Barton et al.
patent: 4965332 (1990-10-01), Barton et al.
patent: 5211877 (1993-05-01), Andrejewski et al.
patent: 5233006 (1993-08-01), Wolter et al.
patent: 5272237 (1993-12-01), Keller et al.
patent: 5292779 (1994-03-01), Keller et al.
patent: 5292830 (1994-03-01), Funayama et al.
patent: 5348917 (1994-09-01), Keller et al.
patent: 5483017 (1996-01-01), Keller et al.
patent: 5559189 (1996-09-01), Dirlikov et al.
patent: 5563181 (1996-10-01), Keller et al.
patent: 5594075 (1997-01-01), Reinhardt et al.
patent: 5644014 (1997-07-01), Schmidt et al.
patent: 5665845 (1997-09-01), Allman
patent: 5681870 (1997-10-01), Keller et al.
patent: 5691435 (1997-11-01), Herzig et al.
patent: 5693689 (1997-12-01), Gibbon
patent: 5721300 (1998-02-01), Knies et al.
patent: 5844052 (1998-12-01), Keller et al.
patent: 5981678 (1999-11-01), Keller et al.
patent: 5986032 (1999-11-01), Keller et al.
patent: 6025453 (2000-02-01), Keller et al.
patent: 6187426 (2001-02-01), Jonschker et al.
patent: 6225247 (2001-05-01), Keller et al.
patent: 6441086 (2002-08-01), Wolfer et al.
Keller Teddy M.
Son David Y.
Hunnius Stephen T.
Karasek John J.
Robertson Jeffrey B.
The United States of America as represented by the Secretary of
LandOfFree
Polymer containing borate and alkynyl groups does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymer containing borate and alkynyl groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymer containing borate and alkynyl groups will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3362384