Solid melt blended phosphite composites
AssigneeDover Chemical Corporation
InventorsDonald R. Stevenson, Satyan Kodali, Carroll W. Larke
Life of this patent
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Abstract
A solid phosphite composite, having at least a portion in amorphous form, which includes at least one, preferably two or more phosphite antioxidants or alternatively at least one phosphite and at least one other polymer additive. The phosphites, at least one of which can initially be a liquid, are generally uniformly distributed since they are melt blended. A desired class of phosphites are the bis(arylalkylphenyl)pentaerythritol diphosphites, at least a portion of which is in amorphous form.
Claims52
A process for forming amorphous bis(2,4-dicumylphenyl)pentaerythritol diphosphite of formula (II)
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- comprising the steps of:
- (a) heating a crystalline form of said bis(2,4-dicumylphenyl)pentaerythritol diphosphite to a temperature to effect melting of said crystalline form of said diphosphite;
- and
- (b) cooling said melted diphosphite to form an amorphous solid bis(2,4-dicumylphenyl)pentaerythritol diphosphite having an initial melting point of between approximately 50° C. and 65° C.
A process for forming amorphous bis(2,4-dicumylphenyl)pentaerythritol diphosphite of formula (II)
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- melt composite comprising the steps of:
- (a) heating a crystalline form of said bis(2,4-dicumylphenyl)pentaerythritol diphosphite to a temperature to effect melting of said diphosphite;
- (b) adding at least one second additive to said diphosphite and mixing therein to form a melt composite;
- and
- (c) cooling said melt composite to below to form a solid melt composite, at least a portion of which is amorphous bis(2,4-dicumylphenyl)pentaerythritol diphosphite having an initial melting point between approximately 50° C. and 65° C.
A process for improving the melt stability of a polymer comprising the step of:
- (a) adding bis(2,4-dicumylphenyl)pentaerythritol diphosphite of formula (II)
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- at least a portion of which is in amorphous form, said amorphous form having an initial melting point between approximately 50° C. and 65° C.
A process for improving the melt stability of a polymer comprising the step of:
- (a) adding a melt blend composite of at least two phosphites one of which is bis(2,4-dicumylphenyl)pentaerythritol diphosphite of formula (II)
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- at least a portion of which is in amorphous form, said amorphous form having an initial melting point between approximately 50° C. and 65° C.
A process for forming amorphous bis(arylalkylphenyl)pentaerythritol diphosphite of formula (I)
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- wherein R1 through R12 are independently selected from the group consisting of hydrogen, C1-4 alkyls, C1-4 alkoxy radicals and further wherein n ranges from 0 to 3, and the substituent is located in a position ortho, meta, or para to the bridging methylene radicals comprising the steps of:
- (a) heating a crystalline form of said diphosphite to a temperature to effect melting of said crystalline form of said diphosphite;
- and
- (b) cooling said melted diphosphite to form an amorphous solid diphosphite having an initial melting point of between approximately 50° C. and 65° C.
A process for forming amorphous bis(arylalkylphenyl)pentaerythritol diphosphite of formula (I)
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- wherein R1 through R12 are independently selected from the group consisting of hydrogen, C1-4 alkyls, C1-4 alkoxy radicals and further wherein n ranges from 0 to 3, and the substituent is located in a position ortho, meta, or para to the bridging methylene radicals comprising the steps of:
- (a) heating a crystalline form of said diphosphite to a temperature to effect melting of said diphosphite;
- (b) adding at least one second additive to said diphosphite and mixing therein to form a melt composite;
- and
- (c) cooling said melt composite to form a solid melt composite, at least a portion of which is amorphous bis(arylalkylphenyl)pentaerythritol diphosphite having an initial melting point between approximately 50° C. and 65° C.
A process for improving the melt stability of a polymer comprising the step of:
- (a) adding bis(arylalkylphenyl)pentaerythritol diphosphite of formula (I)
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- wherein R1 through R12 are independently selected from the group consisting of hydrogen, C1-4 alkyls, C1-4 alkoxy radicals and further wherein n ranges from 0 to 3, and the substituent is located in a position ortho, meta, or para to the bridging methylene radicals, at least a portion of which is in amorphous form, said amorphous form having an initial melting point between approximately 50° C. and 65° C.
A process for improving the melt stability of a polymer comprising the step of:
- (a) adding a melt blend composite of at least two phosphites one of which is bis(arylalkylphenyl)pentaerythritol diphosphite of
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- wherein R1 through R12 are independently selected from the group consisting of hydrogen, C1-4 alkyls, C1-4 alkoxy radicals and further wherein n ranges from 0 to 3, and the substituent is located in a position ortho, meta, or para to the bridging methylene radicals, at least a portion of which is in amorphous form, said amorphous form having an initial melting point between approximately 50° C. and 65° C.
Dependencies are inferred from the claim text.