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Clear Laminating Film: Polyvinyl Butyral Plasticised with Tributyl Citrate and Extruded (Nason, Monsanto, US 2,126,028)
The clear layer inside safety glass must stay rubbery from frost to summer heat and stick to glass on its own. Nason softened polyvinyl butyral with tributyl citrate, which stays in the film far better than the usual phthalate.
Result: a clear, rubbery, non-tacky film that bonds glass under heat and pressure without glue.
Source: Nason, US 2,126,028 (Monsanto, 1938). He used Butvar resin; ours is the polyvinyl butyral we make. Not given: film thickness. Picture drawn by Youblob.
Intermediate
1 day
Instructions
1
1
Weigh resin and plasticiser
Weigh resin and plasticiser
Take 100 parts of polyvinyl butyral resin and 50 parts of tributyl citrate (Nason: 50 or more parts mix freely).
Materials for this step:
Polyvinyl Butyral Resin100 parts
Tributyl Citrate50 partsTools needed:
Balance Scale2
2
Mix with slight warming
Mix with slight warming
Work them together with slight warming in a mixer (or dissolve both in acetone and let it evaporate) until the mass is even.
Tools needed:
Mixing Vessel
Hot Plate3
3
Extrude into sheet
Extrude into sheet
Sheet the plasticised resin, for example by extrusion under pressure. Ours: a plastic extruder with a slot die. Thickness: not given.
Tools needed:
Plastic Extruder
Extrusion Die4
4
Check the film
Check the film
The film should be clear, moderately soft and rubbery, but not tacky. Pressed hot between glass sheets it bonds without adhesive.
Tools needed:
Hot PlateMaterials
2- 100 partsPlaceholder
- 50 partsPlaceholder
Tools Required
5- Placeholder
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