Tinting CR-39 Before UV-NV?

[Randal Cheek]

What is the output of the UV cure lamp you are using? Are you using standard spin equipment like ultra optics miniII with UV cure box? thermo curing is not recommended for this product and it wasn't designed to be used in that manner. Its not surprising that this product would behave incorrectly when used incorrectly. I would stick to extended ultraviolet exposure in order to cure this product. Or as ml43 said, simply switch coatings. Is the hydrophilic coating you want to use thermo cured? If so, switching to a thermo cured hard coat would be essential. When I was processing frontside Multi anti reflective coated lenses and my UV cure box was running too long, the extra heat would cause the AR to craze.....what kind of properties are you hopping for in a finished product, material, coatings, and application? Lots of opticians are on this forum, and I'm sure one of them could make a process recommendation if you'll expand on what it is you hope to accomplish...

[ml43]

I am putting some hydrophilic coating that causes wrinkle. I believe UVNV is based on some aromatic acrylic chemistry. Can you please explain the wrinkling? How can we get rid of it without annealing? What is the reasoning for yellowing due to ambient annealing of this coating?

I'm not too sure what UV-NV is made of, never worked with it.
Yellowing of a clear polymer is normally caused by overexposure to UV(photo degradation) or by over exposure to heat(thermal degradation)
both cause the polymer chains to undergo internal chemical reactions.


The wrinkling/crazing is normally caused by the coating/substrate expanding or contracting at different rates.

If you are dead set on staying with a spin coat application, I would contact SDC, they just acquired LTI which is the leader in spin coat applied hard coating for polymers.

SDC also makes some of the best dip coatings.

They are normally very helpful with these kinds of problems, it's what they do all day.

I'm sure they'll be able to find a coating that can withstand your thermal needs.
If not, dip coating is always the preferred method if heat must be applied(i.e. CVD or PVD processes)

[Chris Ryser]

Look into our MicroTint system ....................

The new cr39 lens I'm using is factory hardcoated on the front surface (not sure if its tintable) so I wanted to try to get a darker tint by tinting first and finishing with a hardcoat....I wasn't sure if it even makes a difference as to how dark you can get a plastic lens after its coated...

Look into our MicroTint system. Latest technology high temperature dyes, and tinted in a Microwave will tint any lens material faster and darker.

[Randal Cheek]

Thats interesting Chris! looks like a cool shortcut for hard to tint lenses....the description seems pretty straight forward, however I couldn't get the video page to load...I'd be interested in taking a closer look at the results...especially the negative gradient...

http://optochemicals.com/micro_shortdescript.htm

[Randal Cheek]

Chris, ..I think I remember reading about a microwavable permanent anti fog treatment of yours a few years back...do you still have that product?

[Chris Ryser]

Chris, ..I think I remember reading about a microwavable permanent anti fog treatment of yours a few years back...do you still have that product?

Randal ......... We invented it, manufacture and sell it since 2009, but it has never really taken off. Maybe I have to wait until Essilor re-invents it like they have done with other products we came up with, years ago.

Also see Oakley's latest Prizm Technology. We had it it in 1984, which is long before they ever thought about it.

There are some industrial safety glasses companies who seem to like it, and purchase it on a regular basis. The optical retail in general, these days, does not seem to be interested.

You can see at: =======>

http://optochemicals.com/paf_antifog.htm

[Chris Ryser]

looks like a cool shortcut for hard to tint lenses

Thats interesting Chris! looks like a cool shortcut for hard to tint lenses....the description seems pretty straight forward, however I couldn't get the video page to load...I'd be interested in taking a closer look at the results...especially the negative gradient...

http://optochemicals.com/micro_shortdescript.htm

Yes it is the perfect solution for hard to tint lenses fast working nice, and does not take up much space.

I just removed the link from my website on that page. It was made by my distributor in Holland years ago. He sold his company and then then the business got closed down a few years ago.

[Randal Cheek]

You can see at: =======>
http://optochemicals.com/paf_antifog.htm

The page is blank for me...

[Chris Ryser]

I checked the original and there was an empty page with everything deleted.

The page is blank for me...
You can see at: =======>

http://optochemicals.com/paf.htm

working now.

Thanks for letting me know. I checked the original and there was an empty page with everything deleted. :stomp:


I copied it from a backup and it is all there again since early this morning. However it disappeared a few more times and it took me 5 hours to correct it.