The present invention relates to novel compositions for production of cast polyamides.

Provided herein is a process for producing a polyamide (P) by reaction of a mixture (M) including at least one lactam (component (A)), at least one catalyst (component (B)), at least one activator (component (C)), and at least one oxazolidine derivative (component (D)). Further provided herein is the mixture (M) and the use of an oxazolidine derivative for increasing the crystallization rate of a polyamide (P). Also provided herein is the use of an oxazolidine derivative in a polyamide (P) for producing a molded article from the polyamide (P) for reducing the demolding time of the molded article and the use of an oxazolidine derivative for removing water from a reaction mixture (RM).

Provided herein is a process for producing a polyamide (P) by reaction of a mixture (M) including at least one lactam (component (A)), at least one catalyst (component (B)), at least one activator (component (C)), and at least one oxazolidine derivative (component (D)). Further provided herein is the mixture (M) and the use of an oxazolidine derivative for increasing the crystallization rate of a polyamide (P). Also provided herein is the use of an oxazolidine derivative in a polyamide (P) for producing a molded article from the polyamide (P) for reducing the demolding time of the molded article and the use of an oxazolidine derivative for removing water from a reaction mixture (RM).

Disclosed herein is an impact modified composition comprising a first polymer; and a second polymer that is dispersed in the first polymer; where the first polymer and the second polymer are melt polymerized in each other's presence, are phase separated from each other after polymerization; are not reactively bonded with each other; and where a precursor to the first polymer and to the second polymer are soluble in one another prior to polymerization. Disclosed herein too is a method comprising melt polymerizing a first monomer and a second monomer in the presence of each other to form a first polymer and a second polymer; where the first monomer and the second monomer are soluble in each other; where first polymer and the second polymer are phase separated from each other with the second polymer being dispersed in the first polymer; where the first polymer and the second polymer are not reactively bonded to each other.

A polymerizable composition comprising a) at feast one cyclic amide, b) from 2.8 to 3.5% by weight, preferably from 2.9 to 3.1% by weight, of at least one blocked polyisocyanate, and c) from 1.2 to 1.4% by weight of at ieast one catalyst for the polymerization of the cyclic amide,
where the ratio by weight of components b) to c) is from 2.0 to 2.9 and the % by weight data are always based on the entirety of components a) to c).

A particulate polyamide is provided. The particulate polyamide is porous and includes at least one of polyamide 4 and polyamide 3. In addition, the particulate polyamide has a particle diameter (d50) of from 10 m to 1,000 m and a particle diameter dispersion degree (Dv/Dn) of not greater than 3.0, wherein Dv represents the volume average particle diameter of the particulate polyamide, and Dn represents the number average particle diameter of the particulate polyamide.

A particulate polyamide is provided. The particulate polyamide is porous and includes at least one of polyamide 4 and polyamide 3. In addition, the particulate polyamide has a particle diameter (d50) of from 10 m to 1,000 m and a particle diameter dispersion degree (Dv/Dn) of not greater than 3.0, wherein Dv represents the volume average particle diameter of the particulate polyamide, and Dn represents the number average particle diameter of the particulate polyamide.

Provided herein according to some embodiments is a method of forming a three-dimensional object comprising nylon 6 by additive manufacturing, as well as objects so produced. Also provided is a polymerizable liquid composition useful for producing a three-dimensional object comprising nylon 6 by additive manufacturing, which composition may include: (a) a light polymerizable first component, and (b) a heat polymerizable second component; said heat polymerizable second component comprising: (i) caprolactam monomers, (ii) a catalyst for anionic polymerization of caprolactam, and (iii) an initiator for anionic polymerization of caprolactam.

Process for the production of solid particles comprising a material. with melting point from 20 to 300 C. at atmospheric pressure, characterized in that a mixture comprising:

a1) the material in molten form and

a2) the material in solid form

is mixed by means of an extruder to give a paste, this is forced through a pelletizing die to give strands, and the strands are comminuted.

The invention relates to a method for preparation of a polyamide 6 copolymer, characterised in that a copolymerization reaction is carried out between: o at least one caprolactam of formula (I): o at least one caprolactam, named substituted caprolactam, in which at least one of the carbon atoms is covalently linked to at least one A moiety, said A moiety being selected from the group formed of: # moieties comprising at least one group of formula: (A) #moieties comprising at least one group of formula: (B) # moieties comprising at least one group of formula: (C) The invention also relates to a polyamide 6, to polyamide 6 filaments and filaments yarns. ##STR00001##