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Non-blocking polymeric articles
| Details |
Inventors: George, Scott Ellery; Fleenor, Coralie McKenna; Bowers, David T.; Miller, Richard Anthony; Thompson, Ricky;
Assignee: Eastman Chemical Company (Kingsport, TN)
Primary Examiner: Short; Patricia A.
Assistant Examiner:
Attorney, Agent or Firm: Owen; Polly C., Graves, Jr.; Bernard J.
The present invention provides an article of manufacture having a coating or is otherwise surrounded in large measure by a second polymer which has non-blocking characteristics. In a preferred embodiment, the article possesses a core polymer which has a T.sub.g of less than 25.degree. C. which is coated with or otherwise surrounded by a second polymer which has a T.sub.g of greater than 25.degree. C., but less than 230.degree. C. Further, preferred core polymers have a number average molecular weight of about 3000 to about 100,000. A further feature of the articles of the present invention is that when heated to temperatures of about 100 to 300.degree. C., they undergo an ester exchange reaction to provide a substantially homogeneous polymer product useful in hot melt adhesive applications. |
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DETAILED DESCRIPTION OF THE INVENTION In a first aspect, the present invention provides an article of manufacture comprising: a substantially amorphous polymer core portion having a T.
sub.
g less than 25.
degree.
C.
; said core portion coated with or surrounded by an outer polymer composition having a Tg greater than 25.
degree.
C.
or a T.
sub.
m greater than 25.
degree.
C.
and less than 230.
degree.
C.
, provided that said polymer Is other than poly(butylene terephthalate); wherein the outer polymer composition sufficiently covers the core portion to prevent blocking when in contact with adjacent core portions, wherein said amorphous polymer core portion and said outer polymer composition are selected from the group consisting of polyesters, polyester-ethers, polyesteramides, and polycarbonates.
In a preferred embodiment, the outer polymer composition will cover at least 60% of the surface area of the core portion.
In a further preferred embodiment of this aspect of the invention, the core portion and the outer polymer composition undergo an exchange reaction, such as an ester exchange, an ester-amide exchange or a carbonate exchange, at a temperature of from about 100.
degree.
to 300.
degree.
C.
Because the two polymers undergo this exchange reaction at elevated temperatures over time, the overall composition will eventually become substantially homogeneous.
In other words, the starting core polymer will have one T.
sub.
g and the starting outer polymer will have a different (i.
e.
, higher) T.
sub.
g, but after the ester exchange reaction, the overall polymer composition will tend to coalesce into a substantially homogeneous polymer composition having one discernible T.
sub.
g.
Thus, in a preferred embodiment, the present invention provides the article as recited above, wherein said core portion and said outer polymer composition undergo an ester exchange reaction at a temperature of from about 100.
degree.
to 300.
degree.
C.
, and wherein observed T.
sub.
g 'S of said composition tend to coalesce into an essentially unitary T
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Manufacturing Materials 
