Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-05-22
2000-10-03
Cooney, Jr., John M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
42840224, 428403, 525 66, 525179, 525183, 525902, C08L 8300
Patent
active
061274569
DESCRIPTION:
BRIEF SUMMARY
The invention relates to multiphase thermoplastic resin compositions and more particularly to compositions in the form of a matrix in which encapsulated nodules are dispersed.
Many thermoplastics have to be modified by incorporating rubbers or other polymers, for example in order to modify the flexural modulus thereof or to improve the impact strength.
The Applicant has discovered that encapsulated nodules could be smaller than nodules formed only from the polymer of the capsule.
This has many advantages, for example when the polymer of the matrix is transparent or even translucent, the reduction in the size of the nodules increases the transparency or makes the polymer more translucent for a constant level of dispersed phase.
U.S. Pat. No. 5,070,145 describes compositions consisting of 80 parts of nylon-6 (PA-6) or nylon-6,6 (PA-6,6) in which 20 parts of a mixture (i) of a copolymer of ethylene and of an ethyl or butyl acrylate and (ii) of a copolymer of ethylene, ethyl acrylate and maleic anhydride have been dispersed. These compositions have good impact strength.
EP 284,379 describes multiphase compositions consisting of a polyamide and of an ethylene copolymer in the form of a polyamide matrix in which nodules (1) of an ethylene-ethyl acrylate-maleic anhydride copolymer are dispersed, and dispersed in these nodules (1) are nodules of polyamides. These nodules (1) are firstly prepared by dispersing a polyamide in the ethylene copolymer, and then these nodules are crosslinked and then dispersed in a polyamide. These compositions are also presented as having a good impact strength.
Patent FR 2,719,849 describes thermoplastic compositions consisting of a matrix of a thermoplastic polymer in which nodules of a second thermoplastic polymer, partially or totally encapsulated by an ethylene copolymer, are dispersed. These compositions are prepared by firstly encapsulating the second polymer and then the other polymer forming the matrix is added under conditions such that the capsules are not destroyed. This preparation is carried out in two steps which are completely separate or with one step following the other in the same extruder. These compositions have both good flexibility and good impact strength. The examples show PA-6, PA-12 or PBT (polybutylene terephthalate) matrices in which are dispersed nodules of PA-6,6 encapsulated by an ethylene-ethyl acrylate-glycidyl methacrylate copolymer. A comparative example shows that in a PA-6 matrix the PA-6,6 nodules encapsulated by the ethylene copolymer are coarser than the nodules formed only from the ethylene copolymer.
The present invention is therefore a thermoplastic composition comprising at least one polymer (M) forming a matrix in which are dispersed nodules of at least one polymer (K) which are encapsulated in at least one polymer (S) in such a way that these encapsulated nodules are smaller than the nodules of the polymer (S) which are dispersed in the matrix (M).
The polymer (M) may be a mixture of several miscible polymers forming a homogeneous phase. The same applies to the polymer (K) and the polymer (S). The compositions of the invention may also comprise several types of encapsulated nodules, for example nodules of (K1) which are encapsulated in (S) and nodules of (K2) which are encapsulated in (S) or else nodules of (K1) which are encapsulated in (S1) and nodules of (K2) which are encapsulated in (S2).
According to one particular embodiment, the present invention is a thermoplastic composition comprising at least one polymer (M) forming a matrix in which are dispersed nodules of at least one polymer (K) which are encapsulated in at least one polymer (S) such that (i) these encapsulated nodules are smaller than the nodules of the polymer (S) which are dispersed in the matrix (M) and such that (ii) the proportion of (M) in the (M)+(S) mixtures is essentially the same as the proportion of (M) in the (M)+(S)+(K) mixtures.
Thus, for example, it has been discovered that the nodules of an ethylene/alkyl acrylate/maleic anhydride copolymer in a nylon-11 (P
REFERENCES:
patent: 3694412 (1972-09-01), Nozaki
patent: 4115475 (1978-09-01), Foy et al.
patent: 4195015 (1980-03-01), Deleens et al.
patent: 4230838 (1980-10-01), Foy et al.
patent: 4331786 (1982-05-01), Foy et al.
patent: 4332920 (1982-06-01), Foy et al.
patent: 4839441 (1989-06-01), Cuzin et al.
patent: 4843144 (1989-06-01), Van Broekhoven et al.
patent: 4864014 (1989-09-01), Cuzin et al.
patent: 4880903 (1989-11-01), Van Broekhoven et al.
patent: 5070145 (1991-12-01), Guerdoux
patent: 5332782 (1994-07-01), Liu et al.
patent: 5457156 (1995-10-01), Liu et al.
Guibouin Chrystelle
Hert Marius
Montanari Thibaut
Perret Patrice
Thomasset Jacques
Cooney Jr. John M.
Elf Atochem SA
LandOfFree
Multiphase thermoplastic resin compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiphase thermoplastic resin compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiphase thermoplastic resin compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-196669