GB734456A - Improvements relating to the production of polyamides - Google Patents

Improvements relating to the production of polyamides

Info

Publication number
GB734456A
GB734456A GB1429353A GB1429353A GB734456A GB 734456 A GB734456 A GB 734456A GB 1429353 A GB1429353 A GB 1429353A GB 1429353 A GB1429353 A GB 1429353A GB 734456 A GB734456 A GB 734456A
Authority
GB
United Kingdom
Prior art keywords
per cent
polymerized
polymer
caprolactam
minutes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1429353A
Inventor
Harold Russell Mighton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US248455A priority Critical patent/US2647105A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to GB1429353A priority patent/GB734456A/en
Priority to FR1078094D priority patent/FR1078094A/en
Priority to DEP9920A priority patent/DE972445C/en
Priority to BE520952D priority patent/BE520952A/xx
Publication of GB734456A publication Critical patent/GB734456A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
    • C08G69/14—Lactams
    • C08G69/16—Preparatory processes
    • C08G69/18—Anionic polymerisation
    • C08G69/20—Anionic polymerisation characterised by the catalysts used

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyamides (AREA)

Abstract

Epsilon-caprolactam is polymerized in the presence as catalyst of an alkali metal hydride. Polymerization is complete in 3-10 minutes at 230-255 DEG C., further heating degrading the polymer. Low polymerization temperatures favour high intrinsic viscosities and high temperatures rapidity of polymerization. The polymers formed at low temperatures contain smaller quantities of water extractables. The cyclic amide should have a water content below about 0.02 per cent. In examples (1) e -caprolactam containing 0.005 per cent water was polymerized at 255 DEG C. in an atmosphere of nitrogen using 0.5 mol. per cent of lithium hydride. The intrinsic viscosity of the polymer varied from 2.28 for a heating time of 5 minutes to 0.78 for a heating time of 8 hours. The polymer was powdered and extruded into a film which remained clear on longitudinal stretching. (2)e -caprolacta was polymerized at 255 DEG C. in 4-5 minutes in the presence of 0.5 mol. per cent of lithium hydride, the polymer having an intrinsic viscosity of about 1.02. (3) Samples of e -caprolactam were polymerized in the presence of 0.5 mol. per cent of lithium hydride at various temperatures and over different periods of time. Figures are given for the intrinsic viscosities of the resulting polymers and their content of water extractables. (4) e -caprolactam was polymerized at 255 DEG C. in 7 minutes in the presence of sodium hydride, the polymer having an intrinsic viscosity of 1.40 and containing about 10.5 per cent of water extractables.
GB1429353A 1951-09-26 1953-05-21 Improvements relating to the production of polyamides Expired GB734456A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US248455A US2647105A (en) 1951-09-26 1951-09-26 Process of polymerizing epsiloncaprolactam
GB1429353A GB734456A (en) 1953-05-21 1953-05-21 Improvements relating to the production of polyamides
FR1078094D FR1078094A (en) 1953-05-21 1953-06-05 Improvements in the manufacture of polyamides
DEP9920A DE972445C (en) 1953-05-21 1953-06-11 Process for the production of polyamides
BE520952D BE520952A (en) 1953-05-21 1953-06-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1429353A GB734456A (en) 1953-05-21 1953-05-21 Improvements relating to the production of polyamides

Publications (1)

Publication Number Publication Date
GB734456A true GB734456A (en) 1955-08-03

Family

ID=10038557

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1429353A Expired GB734456A (en) 1951-09-26 1953-05-21 Improvements relating to the production of polyamides

Country Status (3)

Country Link
BE (1) BE520952A (en)
FR (1) FR1078094A (en)
GB (1) GB734456A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053076A2 (en) * 2004-11-09 2006-05-18 E.I. Dupont De Nemours And Company Ring opening polymerization of cyclic amides using metal amide and metal alkoxide catalysts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053076A2 (en) * 2004-11-09 2006-05-18 E.I. Dupont De Nemours And Company Ring opening polymerization of cyclic amides using metal amide and metal alkoxide catalysts
WO2006053076A3 (en) * 2004-11-09 2006-12-14 Du Pont Ring opening polymerization of cyclic amides using metal amide and metal alkoxide catalysts

Also Published As

Publication number Publication date
FR1078094A (en) 1954-11-15
BE520952A (en) 1953-12-28

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