Process for grafting diacid anhydrides
First Claim
1. A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises:
- (a) adding and mixing molten polyolefin, one or more aliphatic diacid anhydride compositions, organic peroxide, and inert organic solvent in a first reaction zone, under reaction conditions, to produce a partially grafted polyolefin product;
(b) sequentially passing said partially grafted polyolefin product from said first reaction zone through a series of one or more reaction zones; and
(c) mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent with said partially grafted product, under reaction conditions, in each successive reaction zone until the desired level of grafting is achieved.
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Abstract
A process for grafting an anhydride of an unsaturated aliphatic diacid onto a polyolefin comprising:
(a) passing molten polyolefin through at least two injection zones connected in series;
(b) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin; and
(c) passing the grafted polyolefin, in the molten state, into a devolatilization zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized.
133 Citations
33 Claims
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1. A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises:
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(a) adding and mixing molten polyolefin, one or more aliphatic diacid anhydride compositions, organic peroxide, and inert organic solvent in a first reaction zone, under reaction conditions, to produce a partially grafted polyolefin product; (b) sequentially passing said partially grafted polyolefin product from said first reaction zone through a series of one or more reaction zones; and (c) mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent with said partially grafted product, under reaction conditions, in each successive reaction zone until the desired level of grafting is achieved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises:
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(a) continuously adding and mixing molten polyolefin, aliphatic diacid anhydride, organic peroxide, and inert organic solvent in a first reaction zone under reaction conditions; (b) continuously passing the grafted reaction product from said first reaction zone into a second reaction zone; and (c) adding and mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent to said grafted reaction product in said second reaction zone. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A process for grafting an anhydride of an unsaturated aliphatic diacid onto a polyolefin comprising:
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(a) passing molten polyolefin through at least two injection zones connected in series; and (b) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A continuous process for grafting an anhydride of an unsaturated aliphatic diacid having 4 to 20 carbon atoms onto a polyolefin comprising the following steps:
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(i) introducing the polyolefin into an inlet zone, and melting and mixing same in said zone; (ii) passing the molten polyolefin through at least two injection zones connected in series; (iii) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin; and (iv) passing the grafted polyolefin, in the molten state, into an outlet zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized. - View Dependent Claims (33)
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Specification