Flame retardant polymer compositions comprising heat treated phosphorus compounds and melam
AssigneeLANXESS Solutions US Inc.
InventorsZachary D Stockdale, Larry D Timberlake, Mark V Hanson
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Abstract
Flame retardant polymer compositions with excellent processing stability and flame retardant activity are obtained by incorporating into the polymer a flame retardant obtained by heating certain phosphonic acid salts at temperatures of 200° C. or higher and as flame retardant synergist melam or a melam derivative, which compositions are more readily processed under certain harsh conditions than similar compositions comprising similar synergists such as melem, melon and the like.
Claims19
A thermoplastic flame retardant polymer composition comprising:
- a) a thermoplastic polymer;
- b) from 1% to 50%, by weight based on the total weight of the flame retardant polymer composition, of a flame retardant material obtained by a process comprising heating at temperatures of about 200° C. or higher from about 0.01 hour to about 20 hours one or more than one compound of formula (I)
- wherein
- R is C1-12 alkyl, C6-10 aryl, C7-18 alkylaryl, or C7-18 arylalkyl, wherein said alkyl, aryl, alkylaryl, or arylalkyl are unsubstituted or are substituted by halogen, hydroxyl, amino, C1-14 alkylamino, di-C1-4 alkylamino, C1-4 alkoxy, carboxy or C2-5 alkoxycarbonyl;
- M is a metal,
- y is a number of from 1 to 4 so that M(+)Y is a metal cation where (+)y represents the charge formally assigned to the cation, and p is a number of from 1 to 4,
- wherein the flame retardant material is obtained by thermal conversion of the one or more compound of formula (I) before incorporation into the thermoplastic polymer;
- and
- c) one or more compounds selected from the group consisting of melam and melam derivatives, wherein components b) and c) are compounded into molten thermoplastic polymer a) to form the thermoplastic flame retardant polymer composition.
A method for preparing a thermoplastic flame retardant polymer composition, which method comprises adding to a thermoplastic polymer resin
- from 1% to 50%, by weight based on the total weight of the flame retardant polymer composition, of a flame retardant material obtained by a process comprising heating at temperatures of 200° C. or higher from 0.01 hour to 20 hours one or more than one compound of formula (I)
- wherein
- R is C1-12 alkyl, C6-10 aryl, C7-18 alkylaryl, or C7-18 arylalkyl, wherein said alkyl, aryl, alkylaryl, or arylalkyl are unsubstituted or are substituted by halogen, hydroxyl, amino, C1-4 alkylamino, di-C1-4 alkylamino, C1-4 alkoxy, carboxy or C2-5 alkoxycarbonyl;
- M is a metal,
- y is a number of from 1 to 4 so that M(+)y is a metal cation where (+)y represents the charge formally assigned to the cation, and p is a number of from 1 to 4;
- and one or more compounds selected from the group consisting of melam and melam derivatives, and then melt processing the resulting mixture at elevated temperature.
Dependencies are inferred from the claim text.