 Hot-melt adhesive |
| OF PREFERRED EMBODIMENTS In accordance with the present invention, by performing a random ... |
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| Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation |
| All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ... |
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| Crosslinkable polyethylene-based composition for rotational molding |
| OF THE INVENTION As indicated above, the present invention relates to a novel crosslinkable ... |
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| Process for preparation of monocyclopentadienyl metal complex compounds and method of use |
| All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ... |
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| Titanium(II) or zirconium(II) complexes and addition polymerization catalysts therefrom |
| According to the present invention there are provided metal complexes containing one and only one ... |
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| Method for preparing ethylene copolymer |
| What is claimed is: 1. A method for preparing an ethylene copolymer which comprises the step of ... |
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| Ethylene-aromatic vinyl compound copolymer and method for its production |
| It is an object of the present invention to provide an ethylene-aromatic vinyl compound copolymer ... |
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| Polyvinylidene fluoride weather resistant coating compositions including polymethyl methacrylate |
| OF THE PREFERRED EMODIMENT In the following description, the invention is described in terms of a ... |
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| Composite closure |
| An improved composite plastic closure for bottles and other containers has a plastic cap with a ... |
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| Polypropylene closure with removable liner |
| OF THE INVENTION In the drawings, a compression molded polypropylene closure or cap 5 is shown, ... |
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Graft copolymers of para-alkylstyrene/isoolefin copolymers
| Details |
Inventors: Powers, Kenneth W.; Wang, Hsien-Chang; Chung, T-C.; Dias, Anthony J.; Olkusz, Joseph A.;
Assignee: Exxon Chemical Patents Inc. (Wilmington, DE)
Primary Examiner: Teskin; Fred
Assistant Examiner:
Attorney, Agent or Firm: Kortzman; Myron B.
Graft copolymers which are isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile. |
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DETAILED DESCRIPTION This invention is initially based upon the discovery that the polymerization of these particular monomers under certain specific polymerization conditions now permits one to produce copolymers which comprise the direct reaction product (that is, in their as-polymerized form), and which have unexpectedly homogeneous uniform compositional distributions.
Thus, by utilizing the polymerization procedures set forth herein, the novel copolymers of the present invention can be produced.
These copolymers, as determined by gel permeation chromatography (GPC) demonstrate narrow molecular weight distributions and substantially homogeneous compositional distributions, or compositional uniformity over the entire range of compositions thereof.
Put another way, at least about 95 wt.
% of the copolymer product has a para-alkylstyrene content within about 10 wt.
%, and preferably within about 7 wt.
%, of the average para-alkylstyrene content for the overall composition, and preferably at least about 97 wt.
% of the copolymer product has a para-alkylstyrene content within about 10 wt.
%, and preferably within about 7 wt.
%, of the average para-alkylstyrene content for the overall composition.
In a most preferred embodiment hereof, this is demonstrated by the fact that the normalized differential refractive index (DRI) and ultraviolet (UV) curves obtained by GPC for these copolymers are essentially superimposeable on each other and substantially merge into a single curve in most instances.
This substantially homogeneous compositional uniformity thus particularly relates to the intercompositional distribution.
That is, with the novel copolymers of this invention, as between any selected molecular weight fraction the percentage of para-alkylstyrene therein, or the ratio of para-alkylstyrene to isoolefin, will be substantially the same, in the manner set forth above.
In addition, applicants have also found, however, that since the relative reactivity of para-alkylstyrene with isoolefin such as isobutylene is close to one, the intracompositional distribution of these copolymers will also be substantially homogeneous
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Adhesives and Rubbers 
