Curable silicone resin composition and reactive silicon...

Details Curable silicone resin composition and reactive silicon... Curable silicone resin composition and reactive silicon...

2002-12-13

2004-08-24

Peng, Kuo-Liang (Department: 1712)

Coating processes

With post-treatment of coating or coating material

Heating or drying

C528S035000, C528S043000, C525S477000

Reexamination Certificate

active

06780471

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to curable silicone resin compositions and to reactive silicon compounds useful in such curable compositions.
BACKGROUND OF THE INVENTION
Curable silicone resins such as silsesquioxane resins are used in applications which take advantage of their heat and fire resistant properties, for example in fibre reinforced composites for electrical laminates and structural components for automotive, aircraft and naval use, and as interlayer dielectric materials and as abrasion resistant coatings. The resins cure to a rigid product. There is a need for silicone resin compositions of improved mechanical properties, such as increased flexural strength, fracture toughness, modulus and/or mechanical damping, without substantial loss of heat and fire resistance.
The toughness of a silicone resin has been increased by a rubber component, as described in U.S. Pat. No. 5,747,608 or U.S. Pat. No. 5,830,950 or by a silicone fluid as described in U.S. Pat. No. 5,034,061 or CA 691206.
GB 1119666 describes a resinous polymer comprising the reaction product of a compound of the formula (R)
n
(X)
(3−n)
Si—R″—Si(X)
(3−n)
(R)
n
, wherein R is a monovalent hydrocarbon group, R′ is phenylene, diphenylene or diphenylene oxide, X is hydroxy or alkoxy and n is 1 or 2 and a silane of the general formula (R″)
m
Si(Y)
4−m
, wherein R″ is a hydrocarbyl or substituted hydrocarbyl group, Y is alkoxy, acyloxy or hydroxy and m=0-2. GB1101589 describes a process for the production of an organosilicon resin by heating in the presence of a solvent a compound of the formula R1(R2)
2
Si—R—Si(R2)
2
R1 where R is phenylene, diphenylene or diphenylene oxide, R1 is a monovalent hydrocarbon or substituted hydrocarbon group and R2 is alkoxy or hydroxy, with a compound of the formula R4(R3)
2
Si—R—Si(R3)
2
R4 where each R3 is a monovalent hydrocarbon or substituted hydrocarbon group and R4 is acyloxy, alkoxy or hydroxy.
SUMMARY OF THE INVENTION
A curable silicone resin composition according to the present invention comprises (A) an uncured silicone resin having units of the formula (R*)
a
(R)
b
SiO
(4−a−b)/2
, where each R* is a functional group capable of reacting with Si—OH and/or Si-alkoxy groups and each R is a nonfunctional monovalent hydrocarbon group, a+b is from 1.0 to 3.0 and each molecule of uncured silicone resin contains an average of at least two groups R*, and (B) a silanol or hydrolysable compound of the formula
where each R′ represents a hydroxyl group or a hydrolysable group; each R″ represents hydrogen, a monovalent hydrocarbon which optionally is substituted, or a group within the above definition of R′; and Ar is a substantially nonflexible linkage including at least one para-arylene moiety, so that the groups (R′)
2
R″Si— are spatially separated.
The compound (B) reacts with the functional groups R* of the silicone resin to crosslink the resin (A) to a structure having improved mechanical properties and generally less brittle than that obtained by curing the resin (A) alone. The groups (R′)
2
R″Si— are spatially separated by the nonflexible linkage Ar so that intramolecular self-reaction of the groups (R′)
2
R″Si— is avoided.


REFERENCES:
patent: 3464937 (1969-09-01), Bamford et al.
patent: 5034061 (1991-07-01), Maguire et al.
patent: 5747608 (1998-05-01), Katsoulis et al.
patent: 5830950 (1998-11-01), Katsoulis et al.
patent: 691206 (1964-07-01), None
patent: 1101589 (1968-01-01), None
patent: 1119666 (1968-10-01), None
Boury et al., Chem. Mater., 11 (1999) 2796-2803.*
Corriu R. et al; Chem. Mater. (1992) 4, pp. 1217-1224.
Corriu R. et al: Chem. Comm, (1996), 15, pp. 1845-1846.
Shea, K.J. et al:, J. Am. Chem. Soc. 114 (17) (1992) p. 6700.
Loy, D.A. et al: “Bridged Polysilsesquioxanes. Highly porous hybrid organic-inorganic materials”, Chem. Rev. 1995,95, pp. 1431-1442.
Dvornic P.R. et al: “Exactly alternating silarylene-siloxane polymers: 9. Relationships between polymer structure and glass transition temperature”, Macromolecules, vol. 25, No.14, Jul. 6, 1992, pp. 3769-3778.
Corriu R. et al; “Thermal isomerisation of alternating silphenylene-siloxane copolymer”, J.Polymer Science, vol. 32, No. 1, Jan. 15, 1994, pp. 187-191.
Dvornic P.R. et al: “Exactly alternating silarylene-siloxane polymers: 10. Synthesis and characterisation of silphenylene-siloxane polymers containing fluoroalkyl and hydrido side groups”, Macromolecules, vol. 27, No. 20,26.
Cerveau G. et al: “Sol-gel process: temperature effect on textural properties of a monophasic hybrid material”, Chem. Commun., Jul. 26, 1999, pp. 2081-2082.

Affiliated with

Also associated with

Rating

Curable silicone resin composition and reactive silicon... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Curable silicone resin composition and reactive silicon..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Curable silicone resin composition and reactive silicon... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3342981