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
2004-07-27
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...
C528S004000, C528S030000, C528S032000, C525S474000, C525S475000, C525S479000, C501S082000, C501S154000
Reexamination Certificate
active
06767981
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to thermoset polymers and ceramics, and more particularly to silicon and boron-containing thermoset polymers and ceramics.
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 copolymers containing acetylenic and either bis(silyl or siloxyl) carboranyl units or a random distribution of both bis(silyl or siloxyl)carboranyl and bis(sily 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 add to their cost.
Accordingly, it is an objective of certain embodiments of the present invention to provide a thermoset 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 low cost boron-containing thermoset polymer.
SUMMARY OF THE INVENTION
In a first aspect, the present invention provides a thermoset 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, and pyroboric acid under reaction conditions sufficient to crosslink a sufficient number of alkyne bonds to produce a thermoset polymer.
In a second aspect, the present invention provides a method of preparing a thermoset 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, and pyroboric acid under reaction conditions sufficient to crosslink a sufficient number of alkyne bonds to produce a thermoset polymer.
In a third aspect, the present invention provides a thermoset polymer having a repeating unit comprising at least one crosslinking group having at least one unsaturated carbon-carbon bond and at least two bonds that form crosslinks between polymer chains, at least one borate group, at least one silyl group and/or at least one siloxyl group.
In a fourth aspect, the present invention provides a ceramic material produced by pyrolyzing a combination of a first compound having at least one alkynyl group, at least one silyl group and/or at least one siloxyl group and a second compound selected from boric acid, hydrocarbon boronic acid, hydrocarbon borate, and pyroboric acid; or by pyrolyzing a polymeric composition reaction product of a combination of the first and second compounds.
REFERENCES:
patent: 2431878 (1947-12-01), McGregor et al.
patent: 4152509 (1979-05-01), Yajima et al.
patent: 4847154 (1989-07-01), Ryang
patent: 4851491 (1989-07-01), Riccitiello et al.
patent: 4885403 (1989-12-01), Inbasekaran et al.
patent: 4940767 (1990-07-01), Barton et al.
patent: 4952658 (1990-08-01), Kalchauer et al.
patent: 4965332 (1990-10-01), Barton 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: 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: 5693689 (1997-12-01), Gibbon
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: 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
Thermoset and ceramic containing silicon and boron does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermoset and ceramic containing silicon and boron, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermoset and ceramic containing silicon and boron will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3253022