Gharda Chemicals Ltd

Thāne, India

Gharda Chemicals Ltd

Thāne, India

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Patent
Gharda Chemicals Ltd | Date: 2017-07-26

Copolymers of PEEK and PEEK/PEK and methods of preparation thereof are provided. The melt temperatures of the PEEK copolymer and PEEK/PEK copolymer compositions are in the range of 350 C to 420 C. The compositions are based on PEEK monomers biphenol and 4,4-difluorobenzophenone with other PEEK co-monomers such as hydroquinone and PEK co-monomers such as 4-chloro-4- hydroxybenzophenone, 4,4-difluorobenzophenone and 4,4-dihydroxybenzophenone.


Patnaik P.R.,Gharda Institute of Technology | Patnaik P.R.,Gharda Chemicals Ltd
Science and Engineering Ethics | Year: 2015

Along with economic strength, space technology and software expertise, India is also a leading nation in fraudulent scientific research. The problem is worsened by vested interests working in concert for their own benefits. These self-promoting cartels, together with biased evaluation methods and weak penal systems, combine to perpetuate scientific misconduct. Some of these issues are discussed in this commentary, with supporting examples and possible solutions. © 2015 Springer Science+Business Media Dordrecht


Bijwe J.,Indian Institute of Technology Delhi | Sharma S.,Indian Institute of Technology Delhi | Sharma M.,Indian Institute of Technology Delhi | Sharma M.,Leibniz Institute of Polymer Research | And 2 more authors.
Wear | Year: 2013

Polyetherketone (PEK) is one of the least explored specialty thermoplastic polymers for its tribo-utility. It exhibits continuous operating temperature up to 280°C and under short-term loads it can function up to 350°C. In literature, hardly anything is reported on the adhesive wear performance of PEK and its composites. Three composites based on PEK containing short fibers of carbon/glass along with various solid lubricants were developed and characterized for thermal and mechanical properties. The tribo-properties were studied under varying loads and speeds by sliding a composites pin against a mild steel disc as a counter face. The studies were focused to examine the role of these ingredients on enhancing pressure × velocity limit (PVlimit), which is an indication of utility of a tribo-polymer in severe operating conditions. The performance assessment was done according to multiple parameters; such as magnitude of coefficient of friction (μ) and its fluctuations with time, PVlimit, compatibility with the counter-face, specific wear rate (K0), etc. Very low K0 (≈10-16m3/Nm), very low μ (0.04-0.20) and very high PVlimit values (>95.2MPam/s) were reported for these composites. White graphite (hexa boron nitride-hBN) proved to be the most efficient solid lubricant. The wear mechanisms using scanning electron microscopy of worn surfaces of pins and discs were studied. It was interesting to observe that glass fibers in the composite showed extremely good performance instead of showing abrasion and high μ. A very different friction and wear mechanism was claimed to be responsible for this. A synergism between lubricating action of two lubricants and layer of molten glass on the disc was the main reason for the enhanced performance. © 2013 Elsevier B.V.


Trademark
Gharda Chemicals Ltd | Date: 2012-10-08

Herbicides, insecticides, pesticides and fungicides.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, insecticides, pesticides and fungicides for domestic and agricultural use.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, excluding aquatic herbicides, insecticides, pesticides, and fungicides, for use on residential and commercial building construction sites, excluding the construction of ponds and canals.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, insecticides, pesticides and fungicides.


Trademark
GHARDA CHEMICALS Ltd | Date: 2012-07-16

herbicides, insecticides, pesticides and fungicides.


Trademark
Gharda Chemicals Ltd | Date: 2012-09-11

herbicides, pesticides and fungicides for domestic and agricultural use.


Trademark
Gharda Chemicals Ltd | Date: 2011-09-13

Herbicides, insecticides, pesticides and fungicides for domestic and agricultural use.

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