Claims
- 1. A method of reducing toxic emissions of alkylhalo compounds during curing of fluoroelastomers containing bromine and/or iodine cure sites, which comprises;
- i) preparing a curable fluoroelastomer mixture containing at least one fluoroelastomer having bromine and/or iodine cure sites and containing an aliphatic, cycloaliphatic or saturated or unsaturated alkylaromatic organic peroxide;
- ii) adding to the fluoroelastomer mixture from 0.1 to 3 parts by weight of an additive for reducing toxic emissions of alkylhalo compounds from the curable mixture, on curing, based on 100 parts by weight of a fluoroelastomer, comprising at least one compound selected from the group consisting of:
- a) benzothiazole and derivatives thereof of the formula: ##STR34## wherein: X represents H, --SH, ##STR35## b) maleamide derivatives of the general formula: ##STR36## wherein: A=H, and T represents --OH;
- R represents H, alkyl with 1 to 6 carbon atoms, halogen or --NO.sub.2
- c) thiuram derivatives of the formula: ##STR37## wherein: Y represents ##STR38## R.sup.1 represents alkyl with 1 to 4 carbon atoms, d) diphenylguanidine derivatives of the formula: ##STR39## wherein R.sup.2 represents H, alkyl with 1 to 6 carbon atoms; and
- e) maleic anhydride, diaryl-formamide and derivatives of diazo and triazodicyclodecenes; and
- iii) curing the mixture.
- 2. The method of claim 1 wherein said additive is present in the mixture in amounts ranging from about 0.2 to 2 parts per 100 parts by weight of elastomer.
- 3. The method of claim 1 wherein said additive is selected from the group consisting of benzothiazole, 2-mercaptobenzothiazole, benzothiazole disulphide, morpholine-2-benzothiazole sulphenamide and zinc 2-mercapto-benzothiazole.
- 4. The method of claim 1 wherein said additive is selected from the group consisting of tetraalkylthiuram disulphide and zinc diethyldithiocarbomate.
- 5. The method of claim 1, wherein said additive is selected from the group consisting of diphenylguanidine derivatives of the formula: ##STR40## wherein R.sup.2 represents H or an alkyl with 1 to 6 carbon atoms.
Priority Claims (1)
Number |
Date |
Country |
Kind |
22995/88 |
Dec 1988 |
ITX |
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CROSS REFERENCE TO RELATED APPLICATION
This application is a Continuation of application Ser. No. 08/026,165, filed Mar. 1, 1993, now abandoned, which in turn is a Continuation of application Ser. No. 07/798,176, filed Nov. 26, 1991, now abandoned, which in turn is a Rule 60 Continuation of application Ser. No. 07/450,466, filed Dec. 14, 1989, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
101930 |
Jul 1984 |
EPX |
4024343 |
Feb 1991 |
DEX |
Non-Patent Literature Citations (3)
Entry |
Encyclopedia of Chemical Technology (1982) 3rd Ed. vol. 20, pp. 390-396. |
Encyclopedia of Chemical Technology (1979) 3rd Ed. vol. 8, p. 506 |
Encyclopedia of Chemical Technology (1980) 3rd Ed. vol. 11, p. 58. |
Continuations (3)
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Number |
Date |
Country |
Parent |
26165 |
Mar 1993 |
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Parent |
798176 |
Nov 1991 |
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Parent |
450466 |
Dec 1989 |
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