Claims
- 1. A thermoplastic polymeric blend composition comprising:
- (A) a first polyamide which is one or more aliphatic or cycloaliphatic polyamides selected from the group consisting of: polyamides obtained by the polymerization of equimolar proportions of a diamine having two or more carbon atoms between the amine terminal groups with a dicarboxylic acid a polyamide obtained by the polymerization of a monoamino carboxylic acid or an internal lactam thereof with an equimolar proportion of a diamine and a dicarboxylic acid, and a polyamide derived by the condensation of a monoaminocarboxylic acid or an internal lactam thereof having at least two carbon atoms between the amino and the carboxylic acid groups; and
- (B) a second amorphous polyamide which is polymerized from
- (B.sub.1) a polyamide forming monomer selected from the group consisting of lactams, aminoalkanoic acids and combinations thereof, wherein the monomer is present in a molar proportion of about 0 to 50%,
- (B.sub.2) a diamine selected from the group consisting of di(aminoalkyl)benzenes, di(aminoalkyl)halobenzenes, di(amino)alkylbenzenes, di(alkylaminobenzenes), cycloalkylene diamines and combinations thereof, the diamine being present in a molar proportion of about 25 to 60%,
- (B.sub.3) at least one aromatic dicarboxylic acid, the aromatic dicarboxylic acid being present in a molar proportion of about 25 to 60% wherein (A) and (B) are substantially miscible when formed into a blend composition.
- 2. The blend composition according to claim 1 wherein:
- the blend composition further comprises at least one additive or processing aid (C) selected from the group consisting of: heat stabilizers, processing agents, lubricants, mold release agents, ultraviolet stabilizers, organic dyes, pigments, inorganic reinforcing materials, and plasticizing agents.
- 3. The blend composition according to claim 1 wherein:
- the amorphous polyamide (B) exhibits a higher glass transition temperature than the polyamide (A).
- 4. The blend composition according to claim 1 wherein:
- the blend composition comprises up to about 35% by weight of the amorphous copolyamide (B).
- 5. The blend composition according to claim 1 wherein:
- the blend composition exhibits higher barrier properties at 100% humidity as compared to the barrier property of the polyamide (A) at 100% humidity.
- 6. A thermoplastic polymeric blend composition comprising:
- (A) a first polyamide which is one or more aliphatic or cycloaliphatic polyamides selected from the group consisting of: polyamides obtained by the polymerization of equimolar proportions of a diamine having two or more carbon atoms between the amine terminal groups with a dicarboxylic acid, a polyamide obtained by the polymerization of a monoamino carboxylic acid or an internal lactam thereof with an equimolar proportion of a diamine and a dicarboxylic acid, and a polyamide derived by the condensation of a monoaminocarboxylic acid or an internal lactam thereof having at least two carbon atoms between the amino and the carboxylic acid groups, and
- (B) a second amorphous copolyamide which is represented by the following formula: ##STR12## wherein:
- x+y1+y2+y3+z=1
- and,
- y1+y2+y3=x
- wherein n has a value of 5-11, and z=0-0.5 and wherein R is selected from the group consisting of: ##STR13## wherein X is selected from the group consisting of --CH.sub.3 --, an n-alkyl group, and halides,
- Y is selected from the group consisting of H and --CH.sub.3 --, and
- R.sup.1 is an .alpha.,.omega.-alkylene radical containing 4 to 18 carbon atoms wherein (A) and (B) are substantially miscible when formed into a blend composition.
- 7. The blend composition according to claim 6 wherein the .alpha.,.omega.-alkylene radical containing 4 to 18 carbon atoms represented by R' is derived from adipic acid, azelaic acid, sebacic acid or dodecanedioic acid.
- 8. A thermoplastic molding composition comprising the blend composition according to claim 1.
- 9. A film formed from the blend composition according to claim 1.
- 10. An article having improved barrier characteristics comprising at least one layer formed from the blend composition according to claim 1.
- 11. A thermoplastic polymeric composition comprising:
- (A) a first polyamide which is one or more aliphatic or cycloaliphatic polyamides selected from the group consisting of: polyamides obtained by the polymerization of equimolar proportions of a diamine having two or more carbon atoms between the amine terminal groups with a dicarboxylic acid, a polyamide obtained by the polymerization of a monoamino carboxylic acid or an internal lactam thereof with an equimolar proportion of a diamine and a dicarboxylic acid, and a polyamide derived by the condensation of a monoaminocarboxylic acid or an internal lactam thereof having at least two carbon atoms between the amino and the carboxylic acid groups;
- (B) an amorphous second polyamide structurally different from said first polyamide, wherein said second polyamide comprises recurring monomeric units of the formulae:
- (B.sub.1) {--N(H)--R.sub.1 --C(O)--}; and
- (B.sub.2) {--N(H)--R.sub.2 --N(H)--};
- {--C(O)--(R.sub.3).sub.q --C(O)--};
- wherein:
- R.sub.1 is selected from the group consisting of alkylene, alkylarylene, and arylene;
- R.sub.2 is selected from the group consisting of substituted or unsubstituted dialkylenearylene, arylene, cycloalkylene, and cycloalkylenearylene, wherein substituents are alkyl or halo;
- R.sub.3 is selected from the group consisting of arylene and dialkylenearylene; and
- q is 1;
- and wherein the monomers (B.sub.1), (B.sub.2), and (B.sub.3) are present in a molar proportion, (B.sub.1):(B.sub.2):(B.sub.3), of about 0-50%:25-60%:25-60%, based on the total number of moles of amorphous polyamide B, with the total number of moles of (B.sub.1)+(B.sub.2)+(B.sub.3)=100% wherein (A) and (B) are substantially miscible when formed into a blend composition.
- 12. A thermoplastic polymeric composition as recited in claim 11, wherein the monomer (B.sub.1) is caprolactam.
- 13. A thermoplastic polymeric composition as recited in claim 11, wherein the monomer (B.sub.2) is selected from the group consisting of m-xylylene diamine and p-xylylene diamine.
- 14. A thermoplastic polymeric composition as recited in claim 11, wherein the monomer (B.sub.3) is selected from the group consisting of terephthalic acid and isophthalic acid.
- 15. A thermoplastic polymeric composition as recited in claim 11, wherein the monomers (B.sub.1), (B.sub.2), and (B.sub.3) are present in a molar proportion, (B.sub.1): (B.sub.2): (B.sub.3), of about 30-40%:30-40%:30-40%, based on the total number of moles of amorphouspolyamide B, and wherein the number of moles of (B.sub.1)+(B.sub.2)+(B.sub.3)=100%.
- 16. A thermoplastic polymeric composition as recited in claim 11, wherein said composition comprises about 50-95% of polyamide A and about 5-50% of polyamide B.
- 17. A thermoplastic polymeric composition as recited in claim 11, wherein polyamide B has a T.sub.g of at least 100.degree. C., measured at a relative humidity of less than 25%.
- 18. A thermoplastic polymeric composition as recited in claim 11, wherein polyamide B has a T.sub.g of at least 25.degree. C., measured at a relative humidity of 100%.
- 19. A thermoplastic polymeric composition as recited in claim 11, wherein polyamide A is selected from the group consisting of polycaprolactam, polyhexamethylene adipamide, and copolymers thereof.
- 20. A film formed from the thermoplastic polymeric composition according to claim 11, wherein said film has an oxygen permeability, measured at a relative humidity of greater than 90%, of less than or equal to 8.8 cc of oxygen per mil thickness per 100 square inches per day.
- 21. A thermoplastic polymeric composition as recited in claim 11, wherein a blend of said polyamide A and said amorphous polyamide B are sufficiently miscible such that said blend exhibits a single T.sub.g.
- 22. A thermoplastic polymeric composition as claimed in claim 6, wherein X is --Cl.
- 23. A thermoplastic polymeric composition as claimed in claim 6, wherein Y is --CH.sub.3.
- 24. A thermoplastic polymeric composition as claimed in claim 6, wherein R' is selected from the group consisting of adipic acid, azelaic acid, sebacic acid and dodecanedioic acid.
- 25. A thermoplastic polymeric composition as claimed in claim 6, wherein n=5.
Parent Case Info
This application is a continuation of application Ser. No. 868,602, filed Apr. 14, 1992, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (4)
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Date |
Country |
288972A2 |
Nov 1988 |
EPX |
WO9113113 |
Sep 1991 |
EPX |
475720A2 |
Mar 1992 |
EPX |
4023863 |
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JPX |
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Entry |
Hackh's Chem. Dictionary, Third Ed. McGraw-Hill Inc. New York 1944 pp. 671 and 71. |
"The Effect of Structure Upon the Oxygen Permeation Properties of Amorphous Polyamides" T. D. Krizan et al. |
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Continuations (1)
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Number |
Date |
Country |
Parent |
868602 |
Apr 1992 |
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