JPH0625305B2 - Colorless translucent RTV composition - Google Patents

Description

Description: BACKGROUND OF THE INVENTION Most recently, a shelf-stable, fast-curing, one-component, alkoxy-functional, room temperature curable (RTV) composition was assigned to the applicant by US Patent Application No. White et al. Issue 277,524 (June 1981)
Filed on Jun. 26; but disclosed in U.S. Pat. No. 4,395,526 dated Jul. 26, 1983). Basically,
White et al. Provide a moisture curable polyalkoxy-terminated organopolysiloxane RTV composition comprising (1) a silanol-terminated polydiorganosiloxane-based polymer, (2) a crosslinking silane, and (3) an effective amount of chemically bonded hydroxyl groups. It is disclosed to be obtained by combining certain silane scavengers for use and (4) an effective amount of a condensation catalyst. The scavenger may be a separate compound or part of the alkoxy-functional crosslinker, such as oximat,
It has a functional group selected from the group consisting of carbamato, enoxy, amino, amide, imidato, ureido, isocyanato and thioisocyanato.

Other scavenger compositions that can be used in the one-component, alkoxy-functional RTV compositions of White et al. Are RTSwiger and
JE Hallgren, US Patent Application No. 476,000 (19)
Filed March 16, 1983), US patent application No. 349,695 of JJ Dziark (filed February 17, 1982), GM
Lucas U.S. Patent Application No. 464,443 (filed February 4, 1983, Chung et al. U.S. Patent Application No. 428,03).
No. 8 (filed Sep. 29, 1982), Chung's U.S. Patent Application No. 338,518 (1982 No. 11 Jan. application), and TDMitchell's U.S. Patent Application No. 462,9.
No. 49 (filed January 30, 1983). All of these patent applications are assigned to the applicant and are considered prior art to the present invention. In addition, Chung's US patent application No. 49, filed on the same date as the corresponding US patent application to this application and assigned to the applicant.
See also 7,777.

According to the teaching of White et al., The general formula: (In the formula, R ¹ is an aliphatic organic group having 1 to 8 carbon atoms or 7 to 8 carbon atoms selected from the group consisting of an alkyl group, an alkyl ether group, an alkyl ester group, an alkyl ketone group and an alkyl cyano group. 13 is an alkyl group, R ² is a monovalent organic group having 1 to 13 carbon atoms, and X is selected from the group consisting of amido, amino, carbamato, enoxy, imidato, isocyanato, oximato, thioisocyanato and ureido groups. Scavenger (which is a hydrolytically leaving group) that is combined with a diorganopolysiloxane base polymer and an effective amount of a condensation catalyst and, when the hydrolytic leaving group is an enoxy, further with a curing accelerator, A stable moisture curable RTV composition of the one-package type is obtained. White et al. Further preferred that R ² be selected from the group consisting of methyl, phenyl and vinyl, most preferably methyl or a mixture of large amounts of methyl and small amounts of phenyl and / or vinyl, and X It is taught that the groups are preferably amido, amino or enoxy, most preferably amido.

A disadvantage of the preferred White et al. Example, where R ² is methyl and X is enoxy, is that the resulting RTV composition is translucent, but when cured, turns yellow. In view of market and aesthetic issues, it is especially desirable for the cured RTV composition to be colorless.

Accordingly, it is an object of the present invention to provide a stable moisture curable organopolysiloxane composition of the one-package type which produces a colorless, translucent composition upon curing.

Other objects and advantages of the invention will be apparent from the following description.

SUMMARY OF THE INVENTION According to the present invention, there is provided a stable one-package type RTV composition which can be converted into a colorless translucent non-adhesive elastomer, which composition comprises (A) a silicon atom at each chain end. A polydiorganosiloxane-based polymer in which is terminated with at least two alkoxy groups, (B) an effective amount of condensation catalyst, (C) a stable amount of the following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, a is an integer of 1 to 3, b is an integer of 0 to 2 and
+ B is equal to 1 to 3) silane scavenger for hydroxyl functional groups, and (D) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.

According to another aspect of the present invention, the base polymer is silanol terminated, and thus the silane of component (C) is a silane scavenger for hydroxyl functional groups and silicon at each organopolysiloxane chain end. It is a polyalkoxysilane crosslinker terminating in atoms with one vinyl group and two alkoxy groups. This silane has the formula: (R ¹ and X in the formula are as defined above).

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, (A) a polydiorganosiloxane base polymer in which each chain end silicon atom is terminated by at least two alkoxy groups, (B) an effective amount of Condensation catalyst, (C) A stable amount of the following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, a is an integer of 1 to 3, b is an integer of 0 to 2 and
The sum of + b equals 1 to 3) silane scavenger for hydroxyl functional groups, and (D) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, Stable, one-package type, which is stable over a long period of time under ambient conditions substantially free of moisture and can be converted into a colorless translucent tack-free elastomer,
A substantially anhydrous, substantially acid-free, room temperature curable organopolysiloxane composition is proposed.

According to the second aspect of the present invention, an RTV composition that can be converted into a colorless translucent non-stick elastomer is (A) a silanol-terminated base polymer, (B) an effective amount of a condensation catalyst, (C) The following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_{(7-13) is} an aralkyl group and X is an aliphatic enoxy group), provided that this silane is a scavenger for hydroxyl functional groups and that each organopolysiloxane has one silicon group at the chain end. And also a polyalkoxysilane crosslinker terminated with two alkoxy groups, containing (D) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines, and mixtures thereof.

US Patent Application No. 277,524 to White et al. (1981)
The RTV composition disclosed in the application filed on Jun. 26, 2010 is significantly more suitable than the conventional RTV composition because it is stable over a long period of time and is substantially free of acid. The disadvantage of the composition of White et al. Is that its preferred example is a translucent RTV composition which cures to a yellow elastomer, i.e. the silane scavenger has the formula: Where R ² is methyl, or a mixture of a large amount of methyl with a small amount of phenyl and / or vinyl, and X is enoxy. Heretofore, it was generally believed that such yellow deficiencies were also offset by the advantages derived from the composition of White et al., Which involved enoxyscavenger and endcappers.

Surprisingly, however, we have found that inclusion of silanes having vinyl and enoxy functionality as scavengers for hydroxy functional groups or as scavenger / crosslinkers results in the preferred properties disclosed by White et al. In addition, it was found that the resulting composition was translucent and substantially colorless.

The polydiorganosiloxane base polymer may be silanol terminated or alkoxy terminated, both of which are well known in the art and can be readily prepared by one of ordinary skill in the art. For further information, see White et al., U.S. Patent Application, and the publications cited therein, for further information.

With respect to condensation catalysts, such catalysts are well known in the art, almost all of which can be found in the White et al. Tin compounds are suitable as condensation catalysts, and most preferred is dibutyltin diacetate. A surprising advantage of the present invention is that by using vinyl dialkoxy enoxysilane, the tin catalyst can be omitted entirely. This is important because it is believed that the intermediates or by-products mesityl oxide and Sn ⁺⁴ formed during end-capping are responsible for the undesired yellow coloration of the cured elastomer. However, when the tin catalyst is excluded, it is essential to use a guanidine or secondary organic amine type cure accelerator, or catalyst, to endcap the silanol terminated base polymer.

The present invention is based on the surprising discovery that the use of silane scavengers having vinyl and enoxy functionality cures the resulting RTV composition into a translucent, substantially colorless elastomer. As mentioned above, the base polymer can be silanol or alkoxy chain terminated, but the limitations imposed on the scavenger depend on the functionality of the base polymer.

The silane functions only as a scavenger if the base polymer is preterminated with two or more alkoxy groups. Therefore, there are few restrictions imposed on scavengers,
This scavenger is expressed by the following equation.

In the formula, R ¹ is a C _(1-8) aliphatic organic group or C _(7-13) selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
Is an aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, a is an integer of 1 to 3, and b is 0 to 2 And the sum of a + b is equal to 1 to 3.

In another embodiment, the base polymer can be silanol terminated and thus a scavenger and crosslinker of the formula:

In the formula, R ¹ is a C _(1-8) aliphatic organic group or C _(7-13) selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
It is an aralkyl group and X is an aliphatic enoxy group.
In this case, the resulting polymer is vinyl dialkoxy endblocked and has the general formula:

R in the formula is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, and R ¹ is as defined above.

A vinyl dialkoxy end-capped base polymer is preferred,
Vinyldimethoxy end-capped polymers are especially preferred, but other modifications will be apparent to those skilled in the art that provide RTV compositions that cure into a translucent, substantially colorless elastomer. For example, if the base polymer is silanol terminated, the formula
Instead of using a scavenger / crosslinker within the range of (2), the following general formula: (In the formula, R ¹ , R ² and X are as defined above, and c is 1
Or equal to 2 and d equals 1 or 2 and the sum of c + d equals 2 or 3) It is equally possible to use it in combination with a bridging silane in which R ¹ and R ² are as defined above and e is equal to 0 or 1. Of course, such crosslinking silanes can be included in all compositions of the present invention.

In formulas (1), (2) and (3), R, R ¹ and R ² are preferably each methyl, and the hydrolyzable leaving group X in formulas (1) and (2) has a carbon atom number. It is preferably an enoxy group of 5 or less, and is most preferably isopropeneoxy. Accordingly, the most preferred silane cavenger has the formula: Of vinyldimethoxyisopropeneoxysilane.
Other scavengers suitable for use with silanol-terminated base polymers include vinyldimethoxy (but-2-ene-2-oxy) silane and vinyldimethoxy-2 (1
-Carboethoxypropenoxy) silane.

In addition to the above, scavengers for use with polyalkoxy-terminated base polymers include, for example, vinyldimethylisopropeneoxysilane and vinyltriisopropeneoxysilane.

The cure accelerator used in the practice of the present invention is selected from the group consisting of substituted guanidines, amines and mixtures thereof. For more information on such cure accelerators, see White et al., U.S. Patent Application and Takago U.S. Pat. Nos. 4,180,642 and 4,248, above.
See No. 993.

More importantly, another drawback of the White et al. Methyl-enoxy system is that it is a relatively expensive cure accelerator or co-catalyst, such as N-, for promoting the polymer endcapping reaction.
Butyl tetramethyl guanidine is needed. However, by using the highly reactive vinylisopropeneoxy system of the present invention, the polymer end-capping reaction can be promoted with a relatively inexpensive secondary amine such as di-n-hexylamine. Of course, the cure rate measured by tack free time is somewhat longer for secondary amines as compared to butylated guanidine derivatives.

Various fillers can be incorporated into the composition of the present invention, such as titanium dioxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, fumed silica, carbon black, precipitated silica, glass fiber, polyvinyl chloride. , Quartz powder and calcium carbonate can be kneaded. The amount of filler used can be varied within wide limits depending on the intended use. For example, in some sealant applications, curable compositions without fillers may be used, and in other applications, such as binder-forming curable compositions, 700 parts per 100 parts by weight organosiloxane may be used. A large amount of filler as described above can be used. The filler is preferably present in an amount ranging from 10 to 300 parts per 100 parts of organopolysiloxane. In addition, adhesion promoters, anti-sagging agents and plasticizers can be included in the compositions of this invention.

Examples Example 1 Vinyldimethoxyisopropeneoxysilane was synthesized. That is, add 106,8 g (0.7 M) vinylchlorodimethoxysilane, 81.2 g (1.4 M) acetone, 81.3 g (0.8 M) triethylamine, 0.7 g zinc chloride and 50 g acetonitrile to a suitable high pressure reactor. It was The reaction mixture was gradually heated to 100 ° C. with stirring, and this state was continued for 6 hours. After cooling to room temperature, the resulting reaction mixture was filtered to remove triethylamine hydrochloride and then washed with pentane. Next, the solvent was removed by a rotary flash evaporator at 40 ° C. and 100 mmHg. Final product,
Vinyldimethoxyisopropeneoxysilane at 52 ° C /
Distilled at 18 mmHg.

This vinyldimethoxyisopropeneoxysilane
To Semkit Hydroxylate under anhydrous conditions using a mixer
Sil-terminated polymer, filler, butylated guanidine and di-
Blended with butyltin diacetate. Methyldimethoxy
A control composition containing sopropeneoxysilane was also prepared.
It was In both cases, the catalyst was added in two stages as follows.

Example 1 Control example After mixing, the RTV composition was packaged in a sealed aluminum tube for 24 hours at room temperature, 24 hours at 100 ° C, and 10
Stored at 0 ° C for 48 hours. After the end of each aging period,
The composition was cured at room temperature and 50% relative humidity. Curing speed and degree of curing are tack-free time (TFT = tack free time)
And 24 hour durometer measurements. The results are shown in Table I.

As is apparent from this example, the use of vinyldimethoxyisopropeneoxysilane in place of methyldimethoxyisopropeneoxysilane resulted in a translucent, substantially colorless elastomer, which had the conventional preferred composition. It cures to a tack-free material about 4 to 6 times faster than the product. Although the cured elastomers of the present invention exhibit only a slight reduction in color compared to the cured elastomers of conventional compositions, this type of conventional composition is not commercially useful due to its low durometer measurement and long cure time. .

Comparative Example 2 For comparison, the amount of the tin catalyst Bu ₂ Sn (OAc) ₂ was changed from 0.1 g to 0.23 g for the purpose of verifying a composition having a durometer value and a TFT that are almost comparable to the present invention. A composition having the same composition as that of the above-mentioned control example except for the increase was prepared.

The test results of this composition are shown in Part II.

As a result of the test, the composition for this comparison was colored yellow,
It showed a slightly lower durometer value, and it was found that it took about twice as long to cure to a tack-free surface.

Following the procedure of Example 1, a composition containing vinyldimethoxyisopropeneoxysilane and a composition containing methyldimethoxyisopropeneoxysilane (control).
And manufactured. However, in this example Di-n-hexylamine was used in place of Again, both of them carried out the catalyst addition in two steps as follows.

Example 3 Control example The test of Example 1 was carried out on the sample obtained in this example. The results are shown in Table III.

Example 4 This example illustrates the invention as a hydroxyl scavenger for methyldimethoxy terminated polymers. The following composition was made according to the compounding procedure of Example 1.

Example 4 Control example Test samples were made and tested according to the procedure of Example 1. The results are shown in Table IV.

These results also show the advantage of using vinyldimethoxyisopropeneoxysilane to obtain a translucent, substantially colorless elastomer composition.

Example 5 This example demonstrates that the present invention can be practiced to produce a translucent, substantially colorless elastomer without a tin catalyst. However, regarding the results shown in Table V,
It should be noted that it is essential to include a substituted guanidine (rather than an amine) to effect the endcapping of the silanol terminated base polymer.

The following composition was prepared according to the procedure of Example 1.

Combination Table V shows the results of the storage stability test for formulation examples A, B, C and D.

As can be seen from Table V, formulation example B provided a translucent, substantially colorless elastomer composition without the presence of a tin condensation catalyst. Formulation A is an elastomer within the scope of the present invention, which should normally be a light yellow color, but an excess of Sn to keep each parameter of the various Formulations constant.
⁺⁴ was included.

Claims (33)

[Claims] 1. A polydiorganosiloxane-based polymer in which (A) a silicon atom at each chain end is terminated by at least two alkoxy groups, (B) an effective amount of a condensation catalyst, and (C) a stable amount of formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, a is an integer of 1 to 3, b is an integer of 0 to 2 and
The sum of + b equals 1 to 3) silane scavenger for hydroxyl functional groups, and (D) an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof. Stable, one-package type, which is stable over a long period of time in the absence of moisture and can be converted into a colorless translucent tack-free elastomer.
A substantially anhydrous, substantially acid free, room temperature curable organopolysiloxane composition. 2. The polydiorganosiloxane base polymer is silanol terminated and the silane has the formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_{(7-13) is} an aralkyl group and X is an aliphatic enoxy group), and the silane is a scavenger for a hydroxyl functional group, and a silicon atom at the chain end of each organopolysiloxane is a vinyl group and a The composition of claim 1 which is a polyalkoxysilane crosslinker terminating in two alkoxy groups. 3. The following formula of effective dose: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, and e is 0 or 1). The composition according to claim 1 in the range. 4. The silane has the following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, c is equal to 1 or 2, and d is equal to 1 or 2 and the sum of c + d is equal to 2 or 3), and an effective amount of (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, and e is equal to 0 or 1). The composition according to item 2 of the above. 5. A composition according to claim 1 wherein R ¹ and R ^{2 of the} hydroxyl functional silane scavenger are methyl. 6. A composition according to claim 1 wherein the enoxy leaving group of the silane scavenger has 2 to 5 carbon atoms. 7. The composition according to claim 6, wherein the enoxy group is isopropeneoxy. 8. The silane scavenger is vinyldimethoxyisopropeneoxysilane, vinyldimethoxy (but-2-ene-2-oxy) silane or vinyldimethoxy-2 (1-carbethoxypropeneoxy) silane. A composition according to claim 1. 9. The silane scavenger is vinyldimethoxyisopropeneoxysilane.
The composition according to the item. 10. The composition according to claim 1, wherein the curing accelerator is a secondary amine. 11. A composition according to claim 10 wherein said secondary amine is di-n-hexylamine. 12. A composition according to claim 1, which further comprises up to 700 parts by weight of filler. 13. The filler is selected from the group consisting of titanium dioxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, fumed silica, carbon black, precipitated silica, glass fiber, polyvinyl chloride, quartz powder and calcium carbonate. 13. The composition of claim 12 selected. 14. A composition according to claim 1 which further comprises an effective amount of an adhesion promoter. 15. The composition according to claim 1, further comprising an effective amount of anti-sagging agent. 16. The composition of claim 1 further comprising an effective amount of plasticizer. 17. The composition according to claim 1, wherein the condensation catalyst is a tin compound. 18. The composition according to claim 17, wherein the tin compound is dibutyltin diacetate. 19. A silanol-terminated polydiorganosiloxane-based polymer (A), (B) an effective amount of a tin condensation catalyst, (C) a stable amount of vinyldimethoxyisopropeneoxysilane, vinyldimethoxy (but-2-ene). A scavenger / crosslinker silane selected from the group consisting of 2-oxy) silane and vinyldimethoxy-2 (1-carbethoxypropenoxy) silane, and (D) an effective amount of a substituted guanidine, an amine and mixtures thereof. A stable, one-package, containing a curing accelerator selected from the group consisting of stable, long-term, stable, and substantially moisture-free ambient conditions that can be converted into a colorless, translucent, tack-free elastomer. Type of
The room temperature curable organopolysiloxane composition of claim 1 which is substantially anhydrous and substantially acid free. 20. The composition of claim 19 wherein said scavenger / crosslinker silane is vinyldimethoxyisopropeneoxysilane. 21. (A) The number of silicon atoms at each chain end is at least 2.
A polydiorganosiloxane-based polymer terminated with 4 alkoxy groups, (B) a stable amount of the following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, a is an integer of 1 to 3, b is an integer of 0 to 2 and
The sum of + b equals 1 to 3) silane scavenger for hydroxyl functional groups, and (C) an effective amount of a substituted guanidine or amine cure accelerator, which is long-term under ambient conditions substantially free of moisture. Stable, one-package type, which is stable over a period of time and can be converted into a colorless translucent tack-free elastomer.
A substantially anhydrous, substantially acid free, room temperature curable organopolysiloxane composition. 22. The polydiorganosiloxane base polymer is silanol terminated and the silane has the formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_{(7-13) is} an aralkyl group and X is an aliphatic enoxy group), and the silane is a scavenger for a hydroxyl functional group, and a silicon atom at the chain end of each organopolysiloxane is a vinyl group and a The composition of claim 21 which is a polyalkoxysilane crosslinker terminating in two alkoxy groups. 23. The silane has the following formula: (In the formula, R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, X is an aliphatic enoxy group, c is equal to 1 or 2, and d is equal to 1 or 2 and the sum of c + d is equal to 2 or 3), and an effective amount of (Wherein R ¹ is a C _(1-8) aliphatic organic group or C selected from the group consisting of alkyl, alkyl ether, alkyl ester, alkyl ketone and alkyl cyano.
_(7-13) aralkyl group, R ² is a monovalent substituted or unsubstituted C _(1-13) hydrocarbon group, and e is equal to 0 or 1). Range 22
The composition according to the item. 24. The composition of claim 21 wherein R ¹ and R ^{2 of the} hydroxyl functional silane scavenger are methyl. 25. The silane scavenger enoxy leaving group X has 2 to 5 carbon atoms.
The composition according to item 1. 26. The composition according to claim 21, wherein the enoxy leaving group is isopropeneoxy. 27. The silane scavenger is vinyldimethoxyisopropeneoxysilane, vinyldimethoxy (but-2-ene-2-oxy) silane or vinyldimethoxy-2 (1-carbethoxypropeneoxy) silane. A composition according to claim 21. 28. The composition of claim 21 wherein said silane scavenger is vinyldimethoxyisopropeneoxysilane. 29. The composition according to claim 21, further containing up to 700 parts by weight of a filler. 30. The filler is selected from the group consisting of titanium dioxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, fumed silica, carbon black, precipitated silica, glass fiber, polyvinyl chloride, quartz powder and calcium carbonate. 30. The composition of claim 29, which is selected. 31. The composition of claim 21 further comprising an effective amount of an adhesion promoter. 32. The composition of claim 21 further comprising an effective amount of anti-sagging agent. 33. The composition of claim 21 further comprising an effective amount of plasticizer.